JPH07100677A - Welding process for coated panel member - Google Patents

Abstract

PURPOSE:To provide the welding process of a coating film pipe member whose harmful effect caused by the damage of a coating film by heat applied at the time of welding, can be suppressed. CONSTITUTION:A heat insulating material 20c is provided between the panel main body 20a of a coated panel member 20 and a coating film 20b. And, the surface of a side on which the heat insulating material 20c of the coated panel member 20, is not formed, is placed upon another coated panel member 21, and the coated panel members 20 and 21, are welded by irradiating with a laser beam R from another coated panel member 21 side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding method, and more particularly to a method for welding a painted panel member.

[0002]

2. Description of the Related Art When joining a panel member, particularly a panel member made of metal, joining with an adhesive, joining with a bolt / nut, joining with a rivet, joining by welding, or the like is performed.

[0003]

Joining by welding has advantages over other joining methods in that workability at the time of joining is excellent and strength of joining is also good. However, since the joining by welding melts the panel member by heat, when applied to the joining of the panel on which the coating is applied and the coating film is formed, the coating film is damaged by the heat. The problem arises. Despite the above advantages, welding is rarely used for joining painted panels, because damage to the coating film due to this heat deteriorates the appearance of the panel or makes the panel susceptible to rust. Didn't. The present invention has been made in view of the above problems, and an object of the present invention is to provide a welding method for a coated panel member capable of suppressing various adverse effects caused by damage to the coating film due to heat during welding. .

[0004]

In order to achieve the above-mentioned object, in the invention of claim 1, a painted panel is formed by welding a plurality of painted panel members having a coating film formed on the surface thereof from one side of the panel member. It is a method of welding a member, and is configured such that welding is performed by providing means for suppressing transfer of heat from the welded portion to the coating film on the other side of the painted panel. In the invention of claim 2, the suppressing means is a heat insulating material provided between the painted panel member and the coating film on the other side of the painted panel member. Further, in the invention of claim 3, the welding is lap welding which is performed by superposing coating panel members to be welded to each other, and the coating panel members positioned on the other side of the coating panel members to be overlapped are At least a portion that is overlapped with the one-side painted panel member is formed thicker than the one-side painted panel member. Also, claim 4
In the invention, the cooling fluid is made to flow to the other side of the coated panel member during the welding.

Further, in the invention of claim 5, the welding is a lap welding in which the painted panel members to be welded to each other are overlapped with a predetermined space provided therebetween to weld the panels, and at the time of the welding. The cooling fluid is passed through the space. Further, in the invention of claim 6, a method of welding a coated panel member, wherein a plurality of coated panel members having a coating film formed on the surface thereof are welded from one side of the panel member,
In the region near the welded portion, a coating film on at least the other surface of the coated panel member is formed of a heat-resistant paint to perform the welding. According to the invention of claim 7, there is provided a method of welding a plurality of painted panel members having a coating film formed on the surface thereof from one side of the panel member, the method being for welding or after welding. The surface treatment is applied to the area near the welded portion of the painted panel member.
Further, in the invention of claim 8, there is provided a method of welding a plurality of coated panel members having a coating film formed on the surface thereof from one side of the panel member, wherein the welding is performed by welding each other. It is configured to be separated from the other surface of the painted panel.

According to a ninth aspect of the present invention, there is provided a method for welding a coated panel member, wherein a plurality of coated panel members each having a coating film formed on the surface thereof are welded from the rear surface side of the panel member. The above-mentioned welding is performed by previously forming a portion on the coating film located on the side to receive damage of the coating film due to welding heat. Further, in the invention of claim 10, a method of welding a plurality of coated panel members having a coating film formed on a surface thereof is welded from one side of the panel member, wherein the welding is welded to each other. The coating panel members to be joined are partly overlapped with each other. Prior to the coating film forming step, at least one of the coating panel members constitutes an overlapping part, and a rust preventive material and masking are formed in the area. A material is attached, and the welding is performed by using a coated panel member in which a coating is formed on the anticorrosive material and the masking material. Further, in the invention of claim 11, there is provided a method for welding a plurality of coated panel members having a coating film formed on the surface thereof from one side of the panel member, wherein the welding is carried out by welding each other. It is carried out by superposing a part of the coated panel members to be joined together, and prior to the coating film forming step, a masking material is attached to an area that will constitute the superposed portion of at least one panel member, Form a coating film on the surface of the panel member so that the coating film is not formed in the region,
After the coating film forming step, the masking material is removed, and the welding is performed using a coated panel member having no coating film formed on the overlapping portion.

According to a twelfth aspect of the present invention, there is provided a method of welding a plurality of coated panel members having a coating film formed on the surface thereof, wherein the region near the welded portion is formed of a rust preventive material. Welding is performed using the painted panel member
It is configured. In the invention of claim 13, the welding is performed by a high-density energy beam. Further, in the invention of claim 14, the high-density energy beam is a laser beam. Moreover, the claim
In the fifteenth aspect of the invention, the painted panel member is a vehicle body panel that constitutes a vehicle body module that is joined together to form a vehicle body shell, and the welding is welding of the vehicle body modules.

[0008]

According to the invention of claim 1, the heat from the welded part is suppressed from being transferred to the coating film on the other side of the coating panel, so that the coating film on the other side is damaged by the heat generated during welding. I do not receive it. Further, in the invention of claim 2, the heat insulating material between the coating panel member and the coating film on the other side of the coating panel member suppresses heat transfer to the coating film on the front surface side during welding, and the other side. Coating is not damaged by heat generated during welding. Further, in the invention of claim 3, at least the welded portion of the coated panel member located on the other side of the coated panel members to be overlapped is formed thicker than the coated panel member located on the one side. , The heat during welding is hard to transfer to the other side,
The coating on the other side is not damaged by the heat generated during welding.
Further, in the invention of claim 4 or 5, the panel is cooled by the cooling fluid, and the coating film on the other side is not damaged by the heat generated during welding. Further, in the invention of claim 6, in the vicinity of the welded portion, at least the coating film on the other side of the coated panel member is formed of a paint having heat resistance. Is also transmitted,
The coating is not damaged.

Further, in the invention of claim 7, the surface treatment is applied to the area near the welded portion of the coated panel member during or after welding, so that damage of the coating film due to heat generated during welding is repaired. Deterioration of appearance and generation of rust due to damage caused by Further, in the invention of claim 8, since the welding is performed on one side separated from the other surface of the painted panel members to be welded to each other, heat generated during welding is difficult to be transmitted to the other side of the panel member, The coating on the other side is not damaged by the heat generated during welding. Further, in the invention of claim 9, since the welding is carried out by previously forming a portion in the coating film located on the other side of the welded portion to receive damage of the coating film due to welding heat, the coating film due to heat at the time of welding. Damage does not extend to the surface of the coating film on the other side. Further, in the invention of claim 10, prior to the coating film forming step, an anticorrosive material and a masking material are attached to at least one region of the panel member which constitutes the overlapping portion, and the anticorrosive material is attached to the region. Also, since the welding is performed using the coating panel part where the coating film is formed on the masking material, even if the coating film in the overlapping part is damaged by welding heat, rust will occur from this overlapping member. There is nothing to do. Further, in the invention of claim 11, since the welding is performed using the coated panel member in which the coating film is not formed in the overlapping portion, the coating film in the vicinity of the welding is not damaged by the heat during welding.

According to the twelfth aspect of the invention, since the welding is performed using the coated panel member formed in the vicinity of the welded portion with the rust preventive material, the vicinity of the welded portion of the panel member is damaged by heat during welding. However, rust does not occur from this damaged part. In the invention of claim 13 or claim 14,
Since the welding is performed by the high-density energy beam or the laser beam, the area damaged by heat during welding is narrow. Further, in the invention of claim 15, the coating panel member is a vehicle body panel constituting a vehicle body module which is joined to each other to form a vehicle body shell,
Since the welding is the welding of the body modules, the painted body modules can be joined by welding to form the body shell of the automobile.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. In each embodiment, common members are designated by the same reference numerals, and the description thereof will be omitted. First Embodiment In this embodiment, the welding method for a coated panel member of the present invention is applied to the assembly of a body of a 4-door sedan vehicle. The body of the 4-door sedan vehicle is composed of a plurality of units (body modules) that are joined together to form a body shell B. That is, the body shell B is
It is composed of a body module called a lower body shell BL which is composed of an upper body shell BU forming an upper part of the vehicle body, an underbody part BD forming a lower part of the vehicle body, and a front body part BF forming a front part of the vehicle body. The body shell B is made by joining the vehicle body modules by welding. First, the upper body shell BU, the underbody portion BD, and the front body portion BF will be described with reference to FIG. The underbody portion BD includes a floor panel 1 which is a rectangular plate-shaped member,
It comprises a tunnel 2 formed in the floor panel 1 extending in the vehicle front-rear direction, a cross member 3 mounted in the vehicle width direction attached near the center of the floor panel 1 in the vehicle front-rear direction, and the like. The front body part BF has a pair of left and right front side frames 4 extending toward the front of the vehicle body on both sides in the vehicle width direction, a wheel apron reinforcement 5, a rear end of the front side frame 4, and a front end of a lower portion of the cabin. It includes a dash lower panel 6 to be formed, a front frame rear (torque box) 7 and the like extending outward from the rear end of the front side frame 4 in the vehicle width direction.

Further, the upper body shell BU comprises a body side panel 8 forming both side portions of the cabin, a rear body 9 forming a rear portion of the vehicle body, a roof panel 10 constituting an upper portion of the cabin, and the like. Further, the side pillars 8 allow the front pillar 11 and the center pillar 1 to be connected.
2, a rear pillar 13, and a pair of left and right side sills 14 extending in the vehicle front-rear direction on both sides of the lower end of the cabin. A floor portion 15 to which the rear seat RS is attached is formed on the upper body shell BU. In the present embodiment, these vehicle body modules (front body portion BF, underbody portion BD, upper body shell BU) are individually made, and then each vehicle body module is painted. Then, on each painted body module,
Install equipment parts such as instrumental panel I, handle, seat S, floor mat, and trim (Fig. 2).
Further, thereafter, the painted vehicle body modules to which the equipment parts are attached are joined by welding to form the vehicle body.
The front body portion BF and the underbody portion BD are joined by welding the lower end portion of the dash lower panel 6 and the front end portion of the floor panel 1. In addition, the underbody portion BD and the upper body shell BU are joined by welding both side edge portions of the floor panel 1 and the side sill 14 (or the bracket attached to the side sill 14).
It is performed by welding the rear end of the floor panel 1 and the floor 15 located under the rear seat. In the welding in this joining process, the paint panel members composing each vehicle body module are welded to each other, and the coating film of the paint panel members composing each vehicle body module is damaged by the heat generated by the welding. Problem occurs. In order to prevent such a problem, the welded portion of the present embodiment is provided with means for preventing the heat generated by welding from being transferred to the coating film, as described in the second and subsequent embodiments. Has been.

The welded portion in the welding process is not limited to the above-mentioned portion, but may be appropriately changed depending on the structure of the vehicle body or the vehicle body module. For the welding in this welding process, welding by a high-density energy beam such as a laser beam or spot welding by resistance welding is used. When the painted vehicle body modules are joined by a high-density energy beam such as a laser beam, the range of thermal influence due to welding stays in a narrow range, and it becomes possible to minimize damage to the painted surface. Further, since continuous welding is possible, the waterproof property and strength of the welded portion are improved. After joining the body modules by welding to form the body shell, the engine, suspension, and other parts are attached and the assembly operation is completed. The painting process may be performed by temporarily assembling each body module. In this case, after painting is completed, the body after painting is disassembled into vehicle body modules, equipment parts are attached to each vehicle body module, and then the vehicle body modules are joined again by welding. In this embodiment, the engine, suspension, etc. are mounted on the body shell after each module is joined by welding.However, these engines, suspensions, etc. are welded together with the equipment parts such as the instrumental panel, the handle, the seat, the floor mat, and the trim. It may be attached to each body module in advance.

Second Embodiment The following embodiments relate to a concrete method for avoiding various problems caused by damage of the coating film of the coated panel member due to welding heat. Therefore, in the following embodiments, only the welded portions of the painted panel members, which are represented by the welding of the painted vehicle body modules of the first embodiment, will be described. FIG. 3 shows a state in which the coated panel members 20 and 21 are superposed and welded with the laser beam R by the welding method according to the second embodiment of the present invention. In this embodiment, a heat insulating material 20c is provided between the panel body 20a of one of the painted panel members 20 and the coating film 20b. Then, the surface of the coating panel member 20 on the side where the heat insulating material 20c is not provided is superimposed on the other coating panel member 21, and the laser beam R is irradiated from the other coating panel member 21 side to perform both coatings. The panel members 20 and 21 are welded. As the heat insulating material 20c, for example, alumina or silica-based amorphous refractory or glass fiber, calcium silicate-based fibrous heat-insulating agent or heat-resistant inorganic adhesive (for example, Union Dyne under the trade name of Miyajima Ishiwata Rika Kogyo KK ) And the like. In this embodiment, since the heat insulating material 20c is interposed between the coating film 20b on the front side and the welded portion W, heat during welding does not affect the coating film 20b. Therefore, the coating film 20b on the front surface side is not damaged by heat, and it is possible to prevent deterioration of appearance and generation of rust due to heat damage in the vicinity of the welded portion.

Third Embodiment This embodiment is a modification of the second embodiment. The difference between this embodiment and the second embodiment is that the panel body 30a is provided near the welded portion W on the front side surface of the coated panel member 30 on one side.
This is the point where the heat insulating material 32 is provided between and the coating film 30b (see FIG. 4). The heat insulating material 32 is an adhesive material 33.
And is attached to the panel body 30a. The heat insulating material 32 is a metal plate made of aluminum, copper, zinc, or the like,
A coating film 30b that reflects heat from the welded portion W and is on the surface side of the coating panel member 30 (the side opposite to the irradiation direction of the laser beam R)
Protects from heat during welding. Therefore, also in this embodiment, as in the case of the second embodiment, the coating film 30b on the surface side is not damaged by heat, the appearance is deteriorated due to the heat damage in the vicinity of the welded portion, the occurrence of rust, etc. Can be prevented. In this embodiment, the coating film 31a of the coating panel member 31 on the other side is not formed near the welded portion W. Furthermore, the coating 30b is not formed in the vicinity of the welded portion W on the back surface side (the mating surface side) of the painted panel member 30 on the front surface side. Therefore, there is no coating film in the vicinity of the welded portion W of the overlapping portion of the both coated panel members 30 and 31. Therefore, it is possible to prevent the coating film from being damaged by the heat at the time of welding at the overlapping portion near the welded portion W and deteriorating the rust preventive property of the overlapping portion.

As a concrete method for producing the above-mentioned coated panel member having a portion where the coating film is not formed, prior to the coating step, the portion where the coating film is not to be formed is applied with a microphone tape or the like. There is a method in which a mask is applied and coating, that is, a coating film is formed in that state, and the mask is removed after the coating is completed to obtain a coated panel member in which a coating film is not formed on a predetermined portion. Fourth Embodiment This embodiment is a modification of the third embodiment. The difference between this embodiment and the second embodiment is that the heat insulating material 40 is attached to one (front side) painted panel member 30 by welding (see FIG. 5). That is, the heat insulating material 40 of the present embodiment has the panel body 30a and the coating film 30b of the coating panel member 30 on one side by welding at the welded portions w1 and w2.
It is installed between and. This mounting position is on the front side of the welded portion W of the paint panel members 30, 31 as in the third embodiment. Further, the heat insulating material 40 of the present embodiment is a steel plate, and the surface on the welded portion W side is surface-treated with the zinc alloy plating 41. The rust resistance is improved. Also in this embodiment, as in the third embodiment, the coating film 30b on the surface side is
Without being damaged by heat, it is possible to prevent deterioration of appearance and rust due to damage by heat in the vicinity of the welded portion.

Incidentally, the heat insulating material 40 and the painted panel member 30.
The welding points of and are not limited to the two points in the above example. Further, the surface treatment 41 of the steel plate heat insulating material 40 may be omitted. Fifth Embodiment This embodiment is a modification of the fourth embodiment. The difference between this embodiment and the fourth embodiment is the configuration of the heat insulating material 50. The material, the mounting method, the mounting position, etc. of the heat insulating material 50 of this embodiment are the same as those of the heat insulating material 40 of the fourth embodiment, but the surface of the heat insulating material 50 on the welded portion W side is insulated by ceramics or the like. A heat insulating material 51 made of a material is applied or coated (see FIG. 6). This heat insulating material 51 shields heat during welding more efficiently, and the coating film 30 on the front surface side
Since b is not damaged by heat, it is possible to prevent deterioration of appearance and generation of rust due to damage by heat in the vicinity of the welded portion. Sixth Embodiment In this embodiment, two coated panel members 60, 6 to be welded are used.
One of the 60 is thicker than the other 61,
Both of them are overlapped to form a relatively thin coated panel member 6
The laser beam R is irradiated from the 1 side to perform welding (see FIG. 7). When the thickness of the thin panel member 61 is T1 and the thickness of the thick panel member 60 is T2, the thickness ratio of the two panel members is preferably T2 ≧ 1.2T1. Furthermore, when the effect of the thick wall of the welded portion on the coating film 60b of the coated panel member 60 is sufficiently considered, T2 ≧ 2
It is preferable that the thickness of the coated panel member on the order of T1, that is, the thick side, is about twice that of the thin coated panel member.

Therefore, the heat at the time of welding is released in the thick coating panel member 60 in the lateral direction as indicated by the arrow in FIG. 7, and is opposed to the overlapping portion of both coating panel members 60 and 61. It does not affect the coating film 60b formed on the side surface. Therefore, also in the present embodiment, similarly to the third embodiment, the coating film 60b on the front surface side is not damaged by heat, and deterioration of appearance due to heat damage in the vicinity of the welded portion, occurrence of rust, etc. It can be prevented. Seventh Embodiment In this embodiment, a coating fluid is protected from heat generated by welding by flowing a cooling fluid during welding. FIG. 8 shows 2
A state in which a space 72 is provided between the coated panel members 70 and 71, and a laser beam R is irradiated from one panel 71 side to weld both panel members 70 and 71 is shown. At the time of this welding, in the space 72 between both paint panel members, and along the coating film 70b formed on the surface of the other paint panel member 70 on the side opposite to the welded portion W, an arrow in FIG. Flow cooling fluid as shown. Due to this cooling fluid, the coating film 70b provided on the surface of the other coating panel member 70 on the side opposite to the welded portion W is less susceptible to the heat of welding. Specific examples of the cooling fluid include cooling air,
Liquid nitrogen etc. are mentioned.

In this embodiment, both coated panel members 7
Although the cooling fluid is caused to flow through the space 72 between 0 and 71 and the surface opposite to the welded portion W, either one may be used.
In addition, this embodiment shows a welding method in which both coated panel members 70 and 71 are welded separately from each other. In the welding method in which both coated panel members are closely contacted and welded, only the surface opposite to the welded portion is cooled. It may be a fluid for use. Furthermore,
As shown in FIG. 9, the ends of both coated panel members 73 and 74 are bent, and the bent portion (butting portion) is irradiated with a laser beam R to perform welding (hereinafter, referred to as “helical joint in this specification”). "Welding"), at the time of welding, a cooling fluid is supplied from the surface of the coating panel members 73 and 74 on the side opposite to the portion where the laser beam R is irradiated and the welded portion W is formed, as indicated by the arrow. You may run away. In this case, the coating films 73a and 74a formed on the surfaces of the both coated panel members 73 and 74 on the opposite side to the welded portion W are cooled by the fluid and are not damaged by the heat during welding. Eighth Embodiment In this embodiment, the laser beam is irradiated on the premise of a welding method in which the end portions of the coated panel members are overlapped with each other and the laser beam is irradiated only from one side of the overlapped portion to perform welding. The coating film formed on the surface of the coating panel member located on the side opposite to the surface on the side opposite to the surface irradiated with the laser beam is formed of a heat resistant paint.

More specifically, referring to FIG. 10, the painted panel members 80 and 81 to be joined by welding are arranged with their ends overlapped, and one of the painted panel members 81 side to this overlapped part. Irradiating the laser beam R from the side of the coating panel member 81,
81 is joined by welding. Coating film 80b formed on the surface of the painted panel member 80 opposite to the painted panel member 81
Is formed of a heat resistant paint. Therefore, during welding, the coating film 80b is not damaged by the heat of welding. The coating film made of the heat-resistant paint may be formed at least in the range where the heat of welding reaches. Specific examples of heat-resistant paints include silicone resin (eg, silicone resin containing aluminum powder, modified resin containing aluminum powder, silicone resin containing graphite) heat-resistant paint, dichromic acid phosphoric acid heat-resistant paint, organic silicate heat-resistant paint. (For example, ethyl silicate-based heat-resistant paint), organic titamate-based heat-resistant paint (for example, tetra-n-butyl titanate to which aluminum powder is added), and the like. Ninth Embodiment In this embodiment, after welding, a coating repair agent is added to the coating near the welded portion W of the welded coated panel member to repair the coating surface damaged by welding. is there. This will be described in detail with reference to FIGS. 11 and 12. This embodiment is premised on a welding method in which the end portions of the coated panel members 90 and 91 are overlapped with each other and the laser beam R is irradiated from one side (the coated panel member 90 side) of the overlapped portions to perform welding. . After the welding process, a coating film 91b is formed on the surface of the coating panel member 91 on the side not directly irradiated with the laser beam R, which is opposite to the surface welded to the other coating panel member 90. The repair agent is applied by the application means 92. Further, as shown in FIG. 12, after the welding process is completed, the coated panel member 90 on the side directly irradiated with the laser beam R is shown.
Of the coating panel member 91, the coating film 90b formed on the surface opposite to the surface welded to the coating panel member 91 (that is, the surface irradiated with the laser beam R) is coated with the coating repair agent by the coating means 93. You may The coating film repairing agent is applied so as to repair the coating film formed on the surface of the coating panel member 90 or 91 which is damaged by the heat during welding and opposite to the welding surface.

Examples of coating film repairing agents include vinyl chloride-based or polyurethane-based body sealers, anticorrosive paints, and epoxy-based repairing agents. When using a body sealer, a flow gun is used as a coating means. According to this embodiment, the coating film damaged by the heat during welding is repaired after the welding process, so that it is possible to prevent the appearance from being deteriorated and the occurrence of rust due to the damage. Tenth Embodiment This embodiment is a flare joint welding, and as shown in FIG. 13, the abutting portion of the coated panel members 100 and 101 to be welded is opposite to the bending direction of both coated panel members 100 and 101. It is premised on welding that irradiates the laser beam R from the direction (the side on which the coating films 100a and 100b are formed). In this embodiment, the additive supply device 102 attached to a torch for generating a laser beam or the like (not shown).
Therefore, welding is performed while supplying an additive material such as nickel or SUS that enhances the rust preventive property in the vicinity of the welded portion W. As a result, these additive materials 102 are added in the vicinity of the welded portion W, and even if the coating films 100b and 101b in the vicinity thereof are damaged by welding, the rust preventive property is maintained. The additive material is the additive material supply device 10
The powder is supplied from 2 in the vicinity of the welded portion W in the form of powder or wire.

Eleventh Embodiment In this embodiment, as in the tenth embodiment, flare joint welding is performed, and both coated panel members 110 and 111 are bent at the abutting portions of the coated panel members 110 and 111 to be welded. It is premised on welding (see FIG. 14) in which the laser beam R is irradiated from the direction opposite to the direction (the side on which the coating films 110b and 111b are formed). In the present embodiment, the coating film 11 on both coated panel members 110 and 111 after the welding process is completed.
From both 0b and 111b side, both coated panel members 110 and 11
Repair material such as body sealer and zinc 11 near the welding area 1
2 is applied or attached to repair the coating film in this area damaged by the heat of welding (see FIG. 15). As a result,
Coating 110 around here damaged by the heat of welding
b and 111b are covered with repair material, resulting in poor appearance,
Alternatively, it is possible to prevent deterioration of rust prevention. Twelfth Embodiment This embodiment is a heli joint welding, and as shown in FIG. 16, the end faces of the abutting portions of the painted panel members 120 and 121 to be welded are bent in the bending direction of both painted panel members 120 and 121. This is a welding method in which a laser beam R is irradiated to perform welding. In the welding method of the present embodiment, as is apparent from FIG. 16, the coating films 120a, 120 formed on the surfaces of the coated panel members 120, 121 opposite to the bent side.
Since welding is performed at a position away from b, the coating film 120
The influence of heat during welding to a and 120b is suppressed.
It is possible to prevent the deterioration of the appearance or the deterioration of the rust-preventive property due to the damage of the coating film caused by the heat of welding.

Thirteenth Embodiment In this embodiment, the end portions of the coated panel members 130 and 131 are superposed and the laser beam R is irradiated from one side of the superposed portions (the coated panel member 130 side) to perform welding. It is based on the welding method used. In the present embodiment, the coating panel member 131 on the side not directly irradiated with the laser beam R,
The coating film 131b formed on the surface opposite to the welding surface is thickly formed (see FIG. 17). The coating film 131b is formed on the panel main body 131a with a thickness such that when heat is transferred to the coating film 131b from the welded portion W, the heat does not affect the surface of the coating film 131b. Therefore, at the time of welding, even when the heat of welding is transferred to the coating film, the influence does not reach the surface of the coating film, and the appearance is deteriorated due to the damage on the coating film, or the rust prevention property is deteriorated. It can be prevented. Fourteenth Embodiment In this embodiment, a welding method in which the end portions of the coated panel members 140 and 141 are overlapped and a laser beam R is irradiated from one side of the overlapped portions (paint panel member 140 side) to perform welding. Is assumed. As shown in FIG. 18, in this embodiment, the coating films 140b and 141b are not formed on the end portions of the both coating panel members 140 and 141. After the end portions of the both coating panel members 140 and 141 on which the coating film is not formed are overlapped with each other through the masking and anticorrosive material 142, the overlapping portion is irradiated with the laser beam R from one side to apply both coatings. The panel members 140 and 141 are welded. Specific examples of the masking and rust preventive material include modified epoxy adhesives such as Hammatite ES manufactured by Yokohama Rubber Co., Ltd.

Therefore, both painted panel members 140, 141
Will be superposed and welded via the masking and rust preventive material 142, and the sealing property and rust preventive property at this welded portion will be improved. In addition, as shown in FIG. 19, when one end of one coating panel member 144 is processed into a corrugated shape extending in the width direction and when it is overlapped with the other end of the coating panel member 143, a space is formed between both ends. As described above, the space may be filled with a filler 145 that is a heat insulating material or a fusion agent, and welding may be performed. Specific examples of the heat insulating agent include inorganic heat insulating agents such as Isolite board mortar manufactured by Isolite Industrial Co., Ltd., and specific examples of the fusing agent include heat resistant inorganic adhesives such as Union Dyne. Also in this case, the laser beam R used for welding is applied only from one side of the coated panel members 143 and 144 that are overlapped. The coating film 143b of the coating panel member 143 on the side irradiated with the laser beam R has a welded portion W on which the laser beam R is irradiated.
It is not formed in the vicinity, and the coating film 144b of the other painted panel member 144 is not formed in the vicinity of the welded portion W on the surface facing the painted panel member 143. In the example shown in FIG. 19, when the filler is a heat insulating material, the welded portion W
Damage to the coating film in the vicinity due to heat is avoided, and when the filler is a fusion agent, the sealing property and rustproof property at the welded portion W are improved.

Fifteenth Embodiment In this embodiment, the end portions of the coated panel members 150 and 151 are superposed and the laser beam R is irradiated from one side of the superposed portions (the coated panel member 150 side) to perform welding. It is based on the welding method used. As shown in FIG. 20, in this embodiment, plate members 152 and 153 made of a rust preventive material such as stainless steel or titanium are attached to the ends of both painted panel members 150 and 151 by welding. The plate members 152 and 153 are welded together by the laser beam R. Since the coating films 150b and 151b are not formed on the overlapping portions of the plate members 152 and 153, the coating films 150b and 151b are not damaged by the heat during welding. Further, since the welded portion W is formed on the plate members 152 and 153 made of a rust preventive material, there is no problem of rusting at this portion. The plate member 152 of this rust preventive material,
153, as shown in FIG.
It may be attached to each painted panel member 150, 151 by butt welding to the end portions of 0, 151.

[0026]

As described in detail above, according to the welding method of the present invention, it is possible to suppress various harmful effects caused by damage to the coating film due to heat during welding.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing each body module of a body shell joined by a welding method according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which equipment parts are attached to the vehicle body module of FIG.

FIG. 3 is a cross-sectional view of a welded portion of coated panel members for explaining a welding method according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of a welded portion of coated panel members for explaining a welding method according to a third embodiment of the present invention.

FIG. 5 is a cross-sectional view of a welded portion of coated panel members, illustrating a welding method according to a fourth embodiment of the present invention.

FIG. 6 is a cross-sectional view of a welded portion of coated panel members for explaining a welding method according to a fifth embodiment of the present invention.

FIG. 7 is a cross-sectional view of a welded portion of coated panel members, illustrating a welding method according to a sixth embodiment of the present invention.

FIG. 8 is a cross-sectional view of a welded portion of painted panel members for explaining a welding method according to a seventh embodiment of the present invention.

FIG. 9 is a cross-sectional view of a welded portion of coated panel members, illustrating a welding method of a modified example of the seventh embodiment of the present invention.

FIG. 10 is a cross-sectional view of a welded portion of painted panel members, illustrating a welding method according to an eighth embodiment of the present invention.

FIG. 11 is a cross-sectional view of a welded portion of coated panel members, illustrating a welding method according to a ninth embodiment of the present invention.

FIG. 12 is a cross-sectional view of a welded portion of painted panel members, illustrating a welding method according to a ninth embodiment of the present invention.

FIG. 13 illustrates a welding method according to a tenth embodiment of the present invention,
Sectional view of welded parts of painted panel members

FIG. 14 illustrates a welding method according to an eleventh embodiment of the present invention,
Sectional view of welded parts of painted panel members

FIG. 15 illustrates a welding method according to an eleventh embodiment of the present invention,
Sectional view of welded parts of painted panel members

FIG. 16 illustrates a welding method according to a twelfth embodiment of the present invention,
Sectional view of welded parts of painted panel members

FIG. 17 illustrates a welding method according to a thirteenth embodiment of the present invention,
Sectional view of welded parts of painted panel members

FIG. 18 illustrates a welding method according to a fourteenth embodiment of the present invention.
Sectional view of welded parts of painted panel members

FIG. 19 is a cross-sectional view of a welded portion of coated panel members, illustrating a welding method of a modified example of the fourteenth embodiment of the present invention.

FIG. 20 illustrates a welding method according to a fifteenth embodiment of the present invention,
Sectional view of welded parts of painted panel members

FIG. 21 is a cross-sectional view of a welded portion of painted panel members, illustrating a welding method of a modified example of the fifteenth embodiment of the present invention.

[Explanation of symbols]

 R Laser beam W Welded part 20 Painted panel member 20b Coating film 20c Insulation material 21 Painted panel member

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Risuke Nakanishi Shinchi Fuchu-cho Shinichi, Aki-gun, Hiroshima Prefecture Mazda Co., Ltd. (72) Inventor Masatoshi Shinomori Fuchu-cho Shinchi, Aki-gun, Hiroshima Prefecture Mazda Stock In the company

Claims (15)

[Claims] 1. A method of welding a painted panel member, wherein a plurality of painted panel members having a coating film formed on the surface thereof are welded from one side of the panel member, wherein heat from a welded portion is the other of the painted panels. A method for welding a coated panel member, wherein welding is performed by providing means for suppressing transmission to the coating film on the side. 2. The welding method for a painted panel member according to claim 1, wherein the suppressing means is a heat insulating material provided between the painted panel member and the coating film on the other side of the painted panel member. 3. The welding is a lap welding performed by superposing coating panel members to be welded to each other, and at least the one side of the coating panel members located on the other side of the coating panel members to be superposed. 2. The welding method for a painted panel according to claim 1, wherein the portion to be overlapped with the painted panel member is formed thicker than the painted panel member on the one side. 4. The method of welding a painted panel member according to claim 1, wherein a cooling fluid is caused to flow to the other side of the painted panel member during the welding. 5. The welding is lap welding in which coated panel members to be welded to each other are overlapped with a predetermined space provided therebetween to weld the panels, and at the time of the welding, cooling is performed in the space. The method for welding a painted panel member according to claim 1, wherein a fluid is passed through. 6. A method of welding a plurality of coated panel members having a coating film formed on the surface thereof from one side of the panel member, the method comprising the steps of: A welding method for a coated panel member, wherein the coating on the other surface is formed of a paint having heat resistance and the welding is performed. 7. A method for welding a painted panel member, wherein a plurality of painted panel members each having a coating film formed on the surface thereof are welded from one side of the panel member, wherein the painted panel member is welded during or after the welding. A method for welding painted panel members, in which the surface treatment is performed on the area near the welded part of. 8. A method of welding a plurality of coated panel members each having a coating film formed on the surface thereof from one side of the panel member, the welding of the coated panels being welded to each other. A welding method for a painted panel member, which is performed away from the surface on the other side. 9. A method for welding a painted panel member, wherein a plurality of painted panel members each having a coating film formed on the surface thereof are welded from one side of the panel member, wherein the coating film on the other side of the welded portion is previously welded. A method for welding a painted panel member, wherein the welding is performed by forming a portion that receives damage to the coating film due to heat. 10. A method of welding a plurality of coated panel members each having a coating film formed on the surface thereof from one side of the panel member, wherein the welding is performed by welding the coated panel members together. Part of the coating is performed by overlapping, and prior to the coating film forming process, at least one of the coating panel members is covered with an anticorrosive material and a masking material in the area that will form the overlapping portion of the coating panel members. A method for welding a coated panel member, which is mounted and in which the welding is performed by using a coated panel member having a coating film formed on the anticorrosive and masking material. 11. A welding method of a coating panel member, wherein a plurality of coating panel members having a coating film formed on a surface thereof are welded from one side of the panel member, wherein the welding is welded to each other and joined. This is performed by overlapping a part of the panel members. Prior to the coating film forming step, a masking material is attached to at least one of the panel members which will form the above-mentioned overlapping portion, and the masking material is applied to the area. A coating film is formed on the surface of the panel member so that no film is formed, the masking material is removed after the coating film forming step, and at least one sheet is a coated panel member having no coating film formed on the overlapping portion. Welding method for painted panel member 12. A method for welding a painted panel member, comprising welding a plurality of painted panel members having a coating film formed on the surface thereof, wherein the painted panel member is formed in a region near the welded portion with a rust preventive material. Welding method for painted panel members 13. The method of welding a painted panel member according to claim 1, wherein the welding is performed by a high-density energy beam. 14. The method for welding a painted panel member according to claim 13, wherein the high-density energy beam is a laser beam. 15. The body panel according to claim 1, wherein the painted panel members are joined together to form a body module that forms a body shell of an automobile, and the welding is welding between the body modules. Welding method for painted panel members