JP2000218366A - Arc welding method and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an arc welding method and its device for performing easy, sure, and proper welding while controlling a shape of a molten metal corresponding to conditions such as an arrangement of a welding object. SOLUTION: A welding object 1 is fused and jointed by arc discharge. A magnetic field H is generated at a molten metal portion where the welding object 1 is melted, and an electromagnetic force F generated by an electric interaction of the magnetic field H and an arc current I is added to a molten metal 2, so as to perform welding while controlling a shape of the molten metal 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc welding method and an apparatus for melting an object to be welded such as a conductor terminal by arc discharge and joining while controlling the shape of a molten metal.

[0002]

2. Description of the Related Art Conventionally, as a method for joining conductor terminals,
An arc welding method of melting and joining conductor terminals by arc discharge has been used. When the conductor terminal is welded by the arc welding method, the tip of the conductor terminal is melted by arc discharge. At this time, a flat spherical metal melt is generated between the tips of the conductor terminals, and the molten metal is cooled to join the conductor terminals.

[0003]

However, when the conductor terminals are arranged at a narrow pitch (see FIG. 2A),
When joining the conductor terminals to be joined, as shown in FIG. 18, there is a problem that a short circuit may occur between adjacent conductor terminals 90 that should not be joined.

That is, when welding the above-mentioned conductor terminals, a flat spherical molten metal 92 is generated between the tips of the above-mentioned conductor terminals, as described above (FIG. 18). At this time, the molten metal 92 has a flat spherical shape that expands horizontally due to its own weight. Therefore, if the molten metal 92 is excessively expanded, as shown in FIG. 18, there is a risk of short-circuiting with the adjacent conductor terminal 90 which should not be joined. Therefore, it is difficult to join the conductor terminals arranged at a narrow pitch by the conventional arc welding method.

Further, as shown in FIG.
When the clearance D of the conductor terminals 90 is large and the conductor terminals 90 are welded by arc discharge, the molten metal 92 in which the conductor terminals 90 are molten may not be joined to each other. That is, as shown in FIG. 19, the two conductor terminals 90 may be separated from each other only by being melted independently, and there is a possibility that welding is not performed.

The present invention has been made in view of such conventional problems, and performs appropriate welding easily and reliably while controlling the shape of a molten metal in accordance with conditions such as the arrangement of an object to be welded. It is an object of the present invention to provide an arc welding method and an apparatus therefor.

[0007]

According to the first aspect of the present invention, there is provided an arc welding method in which an object to be welded is melted and joined by arc discharge, wherein a magnetic field is generated in a molten metal portion where the object to be welded is melted. An arc welding method is characterized in that an electromagnetic force generated by an electrical interaction between the molten metal and an arc current is applied to the molten metal and welding is performed while controlling the shape of the molten metal.

What is most notable in the present invention is that a magnetic field is generated in the molten metal portion where the above-mentioned welding object is melted, and an electromagnetic force generated by an electrical interaction between the magnetic field and the arc current is applied to the molten metal. This is to perform welding while controlling the shape of the molten metal. To generate a magnetic field in the molten metal part means to generate a magnetic field so that the lines of magnetic force pass through at least a part of the molten metal.

Next, the operation and effect of the present invention will be described.
According to the arc welding method, welding can be performed while controlling the shape of the molten metal in accordance with various conditions at the time of welding.

For example, when there is another part or the like near the object to be welded (for example, FIG. 2), appropriate welding is performed by controlling the shape so that the molten metal does not contact the part. be able to. That is, a magnetic field is generated such that an electromagnetic force in a direction opposite to that of the other components acts on a portion of the molten metal at which contact is likely to occur. This makes it possible to prevent the molten metal from coming into contact with the other components.

When other parts are present at a narrow pitch before, after, right and left of an object to be welded, an appropriate magnetic field is generated so that an electromagnetic force acts such that the molten metal is concentrated at the center of the object. Can do it. Alternatively, when the clearance between a pair of welding objects to be welded is large, welding can be surely performed by generating a magnetic field in which electromagnetic force acts in a direction in which the two molten metals approach each other ( See FIG. 13). As described above, according to the above-described arc welding method, appropriate welding can be performed in accordance with various conditions such as the arrangement and shape of the welding object.

As a means for controlling the shape of the molten metal, an electromagnetic force generated by an electric interaction between a magnetic field and an arc current is used. Therefore, the shape of the molten metal can be controlled without contact, and the shape of the molten metal can be easily and reliably controlled.

As described above, according to the present invention, appropriate welding can be easily and reliably performed while controlling the shape of the molten metal in accordance with conditions such as the arrangement of the welding object.

Next, as in the second aspect of the present invention, the object to be welded may be a conductor terminal in which two or more sets are arranged adjacent to each other. Two or more sets adjacent to each other means that two or more sets of conductor terminals to be welded are arranged adjacent to each other (see FIGS. 2A and 2B).

In this case, by controlling the shape of the molten metal, it is possible to weld only the conductor terminals to be joined while preventing the conductor terminals that should not be joined from being short-circuited by the molten metal. Thus, the conductor terminals can be easily and reliably welded without causing a short circuit.

Next, as in the third aspect of the present invention, the magnetic field may be generated on a plane substantially perpendicular to the arc current in a concentric manner with the center of the welding object as a center. it can. As a result, an electromagnetic force is generated in a direction in which the molten metal concentrates on the central portion of the welding object, and swelling of the molten metal can be suppressed.

[0017] Therefore, when the objects to be welded are adjacent at a narrow pitch, welding can be easily and reliably performed without causing a short circuit with another object to be welded that should not be welded. In addition, the center part of the above-mentioned welding object refers to the center part of the welding point of the above-mentioned welding object.
A central portion between the tips of a pair of conductor terminals.

Next, as in the invention according to claim 4, the magnetic field is generated by arranging a large number of conductors around the object to be welded and flowing a current corresponding to an arc current to the conductors. It is preferable to generate concentrically in the molten metal part. Thereby, an electromagnetic force is generated in a direction in which the molten metal concentrates on the central portion, and swelling of the molten metal can be easily suppressed. Therefore, when the conductor terminals are adjacent at a narrow pitch, welding can be easily and reliably performed without causing a short circuit with another conductor terminal that should not be welded. The current corresponding to the arc current means a current that acts on the arc current and has a direction and magnitude to form a magnetic field that shrinks the molten metal to the center.

Next, the magnetic field can be simultaneously generated in a direction opposite to the molten metal portion. In this case, the swelling of the metal melt in a specific direction can be suppressed. Therefore, it is possible to weld a welding object arranged at a narrow pitch in a specific direction without short-circuiting with another welding object that should not be welded.

Next, as in the invention according to claim 6, the magnetic field can be generated in the molten metal portion by forming a multipolar yoke using a magnet. In this case, the swelling of the metal melt in a specific direction can be easily suppressed. The above multi-pole yoke is
Here, as shown in FIG. 9, a plurality of soft magnetic material members for forming a target magnetic field in the vicinity of the molten metal, and permanent magnets or electromagnets corresponding thereto.

Next, as in the invention according to claim 7, the magnetic field can be generated in the molten metal portion by an induced current generated with a change in arc current. In this case, there is no need to generate a magnetic field from the outside using a magnet, a current, or the like, so that it is not necessary to specially prepare a power supply or the like.

Next, as in the invention according to claim 8, the induced current can be generated in a conductor by arranging a conductor around an object to be welded. In this case, a magnetic field can be easily generated in the molten metal portion.

Next, as in the ninth aspect of the present invention, the object to be welded is two conductor terminals arranged via a predetermined clearance, and at least one of the conductor terminals is provided.
The two conductor terminals may be welded while the two conductor terminals are melted by the arc discharge and the magnetic force is generated by the electromagnetic force so that the molten metal melt extends toward the other conductor terminal. it can.

Thus, even when the clearance between the two conductor terminals is large, it is possible to prevent a problem that the molten metal melted by the arc discharge is melted without being joined to each other. Therefore, the two conductor terminals to be welded can be reliably welded.

Next, according to the tenth aspect of the present invention,
The arc electrode for performing the arc discharge may be arranged at a position corresponding to substantially the middle of the two conductor terminals, and both of the two conductor terminals may be simultaneously melted by the arc discharge. In this case, the two conductor terminals can be melted substantially equally and joined together (see FIG. 13).

Next, as in the eleventh aspect of the present invention,
The arc electrode may be arranged at a position close to one of the two conductor terminals, and the conductor terminal may be mainly melted by arc discharge. In this case, welding can be performed reliably by generating a magnetic field in one direction in one of the molten metals (FIG. 15).
(A)). Therefore, the method of generating the magnetic field can be simplified.

Next, as in the twelfth aspect of the present invention,
The arc electrodes may be arranged one by one at positions corresponding to the two conductor terminals, and the two arc terminals may be used to melt the two conductor terminals by arc discharge. In this case, the two conductor terminals can be melted equally and more reliably and joined together (see FIG. 16).

Next, as in the invention according to claim 13,
An arc welding apparatus for melting and joining an object to be welded by arc discharge, wherein the arc welding apparatus has a magnetic field generating means for generating a magnetic field in a molten metal portion where the object to be welded is melted. An arc welding apparatus is characterized in that an electromagnetic force generated by the electric interaction between the magnetic field and the arc current generated by the means is applied to the molten metal, and welding is performed while controlling the shape of the molten metal. .

By using the above arc welding apparatus,
As described in the description of the first aspect of the present invention, it is possible to easily and surely perform appropriate welding while controlling the shape of the molten metal in accordance with conditions such as the arrangement of an object to be welded.

Next, as in the invention of claim 14,
The welding object may be a conductor terminal in which two or more sets are adjacently arranged. Also in this case, as described in the description of the second aspect of the invention, the conductor terminals can be easily and reliably welded without causing a short circuit.

Next, as in the invention according to claim 15,
The magnetic field generating means may be arranged so as to generate the magnetic field on a plane substantially perpendicular to the arc current and concentrically around the center of the welding object (see FIG. 3). This makes it possible to obtain an arc welding apparatus capable of performing easy and reliable welding by the operation and effect described in the description of the third aspect of the present invention.

Next, as in the sixteenth aspect of the present invention,
The magnetic field generating means is composed of a number of conductors arranged around the object to be welded, and is configured to generate a magnetic field concentrically in the molten metal portion by flowing a current corresponding to an arc current through the conductor. (Figure 5
(See (A) and (B)). This makes it possible to obtain an arc welding apparatus capable of performing easy and reliable welding by the operation and effect described in the description of the fourth aspect of the present invention.

Next, as in the invention according to claim 17,
The magnetic field generating means may be constituted by a plurality of magnets arranged around the object to be welded, and the magnets may generate a magnetic field concentrically in the molten metal part. The magnet is, for example, an electromagnet or a permanent magnet.

Next, as in the invention of claim 18,
The magnetic field generating means is a multipolar yoke formed by using a magnet, and may be configured to simultaneously generate a magnetic field in a direction opposite to the molten metal portion (see FIG. 9). In this case, it is possible to obtain an arc welding apparatus capable of easily controlling the swelling of the molten metal in a specific direction.

Next, as in the invention of claim 19,
The magnetic field generating means may be constituted by a conductor arranged around the object to be welded, and a magnetic field may be generated in the molten metal portion by an induced current generated in the conductor with a change in arc current ( (See FIG. 10). In this case, there is no need to generate a magnetic field using a magnet, current, or the like from the outside, so there is no need to specially prepare a power supply or the like for generating a magnetic field. Therefore, an arc welding apparatus having a simple structure can be obtained.

Next, as in the invention of claim 20,
The object to be welded is two conductor terminals arranged via a predetermined clearance. At least one of the conductor terminals is melted by the arc discharge, and the molten metal is melted by the electromagnetic force. The two conductor terminals can be welded while generating a magnetic field by the magnetic field generation means so that the molten metal extends toward the other conductor terminal (see FIG. 13).

In this case, an arc welding apparatus capable of reliably welding the two conductor terminals to be welded can be obtained by the operation and effect described in the ninth aspect of the present invention.

[0038]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 An arc welding method according to an embodiment of the present invention will be described with reference to FIG. The arc welding method according to the present embodiment is a method in which the welding object 1 is melted and joined by arc discharge. In the present embodiment, a magnetic field H is generated in the molten metal portion where the welding object 1 is melted, and the magnetic field H and the arc current I are generated.
Is applied to the molten metal 2 by the electric interaction. Thereby, welding is performed while controlling the shape of the molten metal 2.

That is, as shown in FIG. 1, at the time of arc discharge, a magnetic field H is generated in a direction orthogonal to an arc current I generated from the arc electrode 3 toward the workpiece 1. At this time, an electromagnetic force F is generated in the molten metal 1 in a direction orthogonal to the arc current I and the magnetic field H (a direction according to Fleming's law). Welding is performed while controlling the shape of the molten metal 2 by the electromagnetic force F.

Next, the operation and effect of this embodiment will be described. According to the arc welding method, welding can be performed while controlling the shape of the molten metal 1 in accordance with various welding conditions.

For example, when there is another part or the like near the welding object 1, by controlling the shape so that the molten metal 2 does not contact the part, appropriate welding can be performed. . That is, the magnetic field H is generated such that the electromagnetic force F in the direction opposite to the direction of the other components acts on the portion of the molten metal 1 where there is a possibility of contact. This gives
The molten metal 2 can be prevented from contacting the other components.

When other parts and the like are present at a narrow pitch before, after, right and left of the welding object 1, a magnetic field H is generated by generating an electromagnetic force F such that the molten metal 2 is concentrated at the center. Welding can be performed. As described above, according to the above-described arc welding method, appropriate welding can be performed according to various conditions such as the arrangement and the shape of the welding target 1.

As means for controlling the shape of the molten metal 2, an electromagnetic force generated by an electric interaction between a magnetic field and an arc current is used. Therefore, since the shape of the molten metal can be controlled in a non-contact manner, the shape of the molten metal can be easily and reliably controlled.

Since the electromagnetic force F is caused not only by the magnetic field H but also by the arc current I, the electromagnetic force F does not act when the arc welding is completed. However, after the completion of the arc welding, the molten metal solidifies quickly, so that there is no problem that the shape returns to the original shape even when the electromagnetic force stops working. If there is a possibility of such a situation, means for forcibly cooling the molten metal at the same time as the completion of the arc welding can be used.

As described above, according to the present embodiment, there is provided an arc welding method capable of easily and reliably performing appropriate welding while controlling the shape of a molten metal in accordance with conditions such as arrangement of an object to be welded. Can be.

Embodiment 2 As shown in FIGS. 2 to 5, the present embodiment is directed to a case where a large number of conductor terminals 10 are arranged adjacent to each other.
Is an example of arc welding. Two or more pairs are adjacent
This means that two or more pairs of conductor terminals 10 to be welded are arranged adjacent to each other. That is, FIG. 2 (A) shows a pair of conductor terminals 11 and 12 to be welded to each other. Indicates a state in which

The following third to fifth embodiments are also based on the premise that such a conductor terminal 10 is arc-welded.
2 to 10, the direction of arrow M is forward.

In this embodiment, in performing the arc welding, as shown in FIG. 3, the magnetic field H is concentrically arranged on a plane substantially perpendicular to the arc current I with the center of the molten metal 2 as the center. Generate in the form. As a means for generating the magnetic field H, as shown in FIGS. 5 (A) and 5 (B), a large number of conductors 4 are arranged around the object 1 to be welded. That is, means for flowing a current I _{0 in the} opposite direction to the arc current is used.

Next, the operation and effect of this embodiment will be described. As described above, by passing the current I ₀ , a concentric magnetic field H centering on the central portion of the molten metal 2 is generated (FIG. 5B). The direction of the magnetic field H is clockwise (clockwise) with respect to the direction of the arc current I (FIGS. 3 and 5B).

Due to the interaction between the magnetic field H and the arc current I, as shown in FIGS. 2C and 4B, an electromagnetic force F acts on each part of the molten metal 2 toward the central portion. Therefore, the molten metal 2 tends to concentrate on the central portion. Thereby, the swelling of the molten metal 2 can be easily suppressed. That is, when the magnetic field H is not generated, as shown in FIG. 4 (A), the shape of the metal swell 2 which is greatly expanded is concentrated at the center by the electromagnetic force F as shown in FIG. 4 (B). Can be controlled. Therefore, welding can be easily and reliably performed without causing a short circuit with another conductor terminal 10 which is arranged adjacently at a narrow pitch and should not be welded.

Therefore, according to this embodiment, by controlling the shape of the molten metal, it is possible to weld only the conductor terminals to be joined while preventing the conductor terminals that should not be joined.

Embodiment 3 In this embodiment, when welding the conductor terminals 10 shown in Embodiment 2, as shown in FIGS. 6 to 8, the magnetic fields H ₁ and H _{2 in} directions opposite to the molten metal portion. Are simultaneously generated to control the shape of the molten metal 2. That is, as shown in FIG. 2A shown in the second embodiment, when the conductor terminals 10 arranged at a narrow pitch in front and rear are welded, FIG.
As shown in, giving a magnetic field H ₁ of the right in the front half of the molten metal 2 of the conductor terminal 10 to be welded, after half gives the left of the magnetic field H _2.

[0053] The interaction of the magnetic field H ₁ and arc current I, the front half of the molten metal acts the electromagnetic force F ₁ backward, whereas, by the interaction of the magnetic field H ₂ and arc current I, the molten metal of the front half forward electromagnetic force F ₂ is applied (FIG. 7 (B)).

Accordingly, when no magnetic field is generated,
As shown in FIG. 7 (A), the shape of the metal swell 2 which greatly expands can be made into a fallen circle shape as shown in FIG. 7 (B) by suppressing expansion in the front-back direction. Therefore, as shown in FIG. 8 (A), the conductor terminals 10 which are not to be welded and which may be short-circuited when no magnetic field is generated as shown in FIG.
Welding is possible without short circuit.

Fourth Embodiment As shown in FIG. 9, this embodiment is an example in which a magnet is used to form a four-pole type yoke to generate a magnetic field in the above-mentioned molten metal part. That is, as shown in FIG. 9, the N pole 51 of the magnet 5 is
S pole 52 is disposed on the right front and left rear of the molten metal 2.

In this case, opposite magnetic fields H ₁ and H ₂ as shown in the third embodiment can be easily generated in the front half and the rear half of the molten metal. At this time, opposite magnetic fields H ₃ and H ₄ are also applied to the right half and the left half of the molten metal. The directions of the magnetic fields H ₃ and H ₄ are forward in the right half and downward in the left half.

Due to the interaction between the magnetic field H ₁ and the arc current I, a backward electromagnetic force F ₁ acts on the front half of the molten metal, while the interaction between the magnetic field H ₂ and the arc current I causes the molten metal to flow. of the front half forward electromagnetic force F ₂ acts. Further, the interaction of the magnetic field H ₃ and arc current I, the right half of the molten metal acts the electromagnetic force F ₃ rightward, whereas the interaction of the magnetic field H ₄ and the arc current I, of the molten metal the left half acting electromagnetic force F ₄ leftward.

Thus, when no magnetic field is generated,
As shown by the dotted line in FIG. 9, the shape of the metal swell 2 that expands greatly can be made into a fallen circle by suppressing the expansion in the front-rear direction as shown by the solid line in FIG. 9. Therefore, as shown in FIG. 8 (A), the conductor terminals 10 which are not to be welded and which may be short-circuited when no magnetic field is generated as shown in FIG.
Welding is possible without short circuit.

Fifth Embodiment As shown in FIG. 10, this embodiment is an example in which the above-mentioned magnetic field is generated in the above-mentioned molten metal part by an induced current generated with a change in arc current. That is, the two conductors 41 and 42 are arranged before and after the conductor terminal 10 in parallel with the direction in which the arc current I flows.

By the way, at the time of arc welding, the arc current can be increased with time by controlling the arc power source, for example, as shown in FIG. In this case, as the current increases, the induced currents I ₁ and I ₂ having a magnitude proportional to the increase amount flow through the two conductors 41 and 42. Similarly, when the arc current is reduced with time, an induced current corresponding to the reduced amount can be generated. Therefore, it is possible to generate an induced current in the opposite direction to the arc current I by controlling the arc power supply and the arrangement of the surrounding conductors.

The induced currents I ₁ and I ₂ generate magnetic fields H ₅ and H ₆ around them. These magnetic fields H ₅ and H ₆ are also generated in the above-mentioned molten metal part, and the direction thereof is such that the magnetic field H ₅ is rightward,
Magnetic field H ₆ is left. Then, the rear side of the magnetic field H ₅ and the arc current backward electromagnetic force F ₅ on the front side of the molten metal 2 by interaction with I, the molten metal 2 by an interaction between the magnetic field H ₆ and the arc current I Has a forward electromagnetic force F
₆ works.

The reason is that the electromagnetic forces F ₅ and F ₆ are proportional to the magnitudes of the magnetic fields H ₅ and H ₆ , and the magnitude of the magnetic fields is the current I ₁ ,
It is inversely proportional to the square of the distance from I ₂ . Therefore, the electromagnetic forces F ₅ and F ₆ are largely generated in portions near the conductors 41 and 42, respectively. Therefore, the current I ₁ and the electromagnetic force F ₅ caused by the magnetic field H ₅ are present in front of the molten metal 2, and the current I ₆ and the electromagnetic force F ₆ caused by the magnetic field H ₆ are present in front of the molten metal 2. It can be considered to work.

As a result, when the magnetic field is not generated (when the arc current I is not controlled or when the predetermined conductors 41 and 42 are not arranged), the shape of the metal swell 2 which greatly expands as shown by the solid line in FIG. 10, the swelling in the front-rear direction can be suppressed. Therefore, the conductor terminals 10 (FIG. 8A), which are arranged at a narrow pitch in the front-rear direction and may be short-circuited when no magnetic field is generated, which should not be welded, can be welded without short-circuiting ( FIG. 8 (B)). Further, in the case of this example, there is no need to generate a magnetic field from the outside using a magnet, a current, or the like, so that there is an advantage that it is not necessary to specially prepare a power supply or the like.

Sixth Embodiment As shown in FIGS. 12A and 12B, this embodiment is an example in which an arc current flows from a conductor terminal 10 which is an object to be welded to an arc electrode 3. The flowing direction of the arc current differs depending on the material of the welding target. Therefore, the arc current may be opposite to that shown in the first to fifth embodiments.

Therefore, as described above, when an arc current flows from the conductor terminal 10 to the arc electrode 3 (in the direction opposite to the arrow I in FIGS. 1 and 3), the metal melt 2 is controlled to control the conductor terminal. 10 is arc welded. In this example,
The conductor 4 in the embodiment 2, electric current I ₇ when the reverse embodiment 2. That is, the current I ₇ is a the arc current and reverse. Others are the same as the second embodiment.

As described above, by passing the current I ₇ , a magnetic field H ₇ having a direction opposite to the magnetic field H in the second embodiment is generated around the metal melt 2 (FIG. 12).
(B)). Therefore, by interacting with the magnetic field H ₇ and the arc current, it is possible to suppress the bulge of cases similarly to the metal melt 2 Embodiment 2 (FIG. 2 (C), the
FIG. 4 (B)). That is, according to this example, when the arc current is directed from the conductor terminal 10 to the arc electrode 3, the same operation and effect as in the second embodiment can be obtained.

Embodiment 7 In this embodiment, as shown in FIGS. 13 and 14, two conductor terminals 10 arranged via a predetermined clearance D are melted by arc discharge and the molten metal melt is melted. 2 is an example of an arc welding method in which welding is performed while applying an electromagnetic force F ₈ to the workpiece 2. That is, as shown in FIG. 13 (A), a magnetic field H ₈ is generated such that the electromagnetic force F ₈ acts so that the molten metal 2 in which the two conductor terminals 10 are melted extends toward the other conductor terminal 10. The two conductor terminals 1
0 is welded.

The arc electrode 3 for performing the arc discharge
Is arranged at a position substantially corresponding to the middle of the two conductor terminals 10, and both of the two conductor terminals 10 are simultaneously melted by arc discharge (FIG. 13A). Further, as shown in FIG. 13A, the magnetic field H ₈ is generated concentrically around a position corresponding to the middle between the two conductor terminals 10. The direction of the magnetic field H ₈ is a right-handed (clockwise) relative to the direction of the arc current I of the arc discharge.

The method of generating the magnetic field is as follows.
For example, as shown in FIG. 5 of the second embodiment, a large number of conductors 4 are arranged around the two conductor terminals 10, and a current I ₀ opposite to the arc current I flows through the conductors 4. Use means. Other configurations are the same as those of the first embodiment.

By the interaction between the arc current I and the magnetic field H ₈ , an electromagnetic force F ₈ acts in a direction in which the two metal melts 2 respectively face the other conductor terminals 10 (FIG. 13).
(A), FIG. 14 (A)). As a result, FIG.
As shown in FIG. 14B, the two molten metals 2 are joined to each other.

As described above, according to this embodiment, even when the clearance D between the two conductor terminals 10 is large,
It is possible to prevent a problem that the metal melts 2 melted by the arc discharge are not joined to each other but melted apart. Therefore, the two conductor terminals 10 to be welded can be reliably welded. In addition, the third embodiment has the same functions and effects as the first embodiment.

Embodiment 8 In this embodiment, as shown in FIG. 15, the arc electrode 3 is connected to one of the two conductor terminals 10.
This is an example in which the conductor terminals 10 are arranged at a position close to the conductor, and the conductor terminals 10 are mainly melted by arc discharge to perform welding.

That is, as shown in FIG. 15A, the one conductor terminal 10 is mainly melted by the arc discharge, and the molten metal 2 is applied to the electromagnetic force F ₉ in the direction toward the other conductor terminal 10. A magnetic field H ₉ is generated so as to act. As a result, as shown in FIG. 15B, the two conductor terminals 10 arranged with a predetermined clearance D therebetween.
To weld. Others are the same as the seventh embodiment.

In the case of this example, by generating a unidirectional magnetic field H ₉ in one of the metal melts 2, welding can be performed reliably (FIG. 15A). Therefore, the method of generating the magnetic field can be simplified. In addition, it has the same function and effect as the seventh embodiment.

Embodiment 9 In this embodiment, as shown in FIG. 16, two arc electrodes 3 are arranged at positions corresponding to the two conductor terminals 10, respectively. This is an example in which the conductor terminal 10 is melted by arc discharge.

That is, as shown in FIG.
The two conductor terminals 10 are melted by the two arc electrodes 3, and the magnetic field H _{10 is} applied so that the two melted metal melts 2 apply an electromagnetic force F _{10 in a} direction toward the conductor terminals _10.
Generate. Thus, as shown in FIG. 16B, the two conductor terminals 10 arranged via the predetermined clearance D are welded.

[0077] As the way of generation of the magnetic field H ₁₀ can be, for example, as in Embodiment Example 4, using the magnet 5 4
A means of forming a polar yoke is used (FIG. 17).
In the present embodiment, the arrangement of the north pole 51 and the south pole 52 of the magnet 5 is all reversed with respect to the fourth embodiment. This gives
As shown in FIG. 17, magnetic fields H ₁₀ and H ₁₁ are generated in opposite directions to the fourth embodiment, and the electromagnetic force F is applied to the molten metal 2.
_10, F ₁₁ acts.

Of the electromagnetic forces F ₁₀ and F ₁₁ , the electromagnetic force F
₁₀ acts in a direction in which the metal melts 2 of the two conductor terminals 10 arranged via the clearance D attract each other, and the two are joined to perform welding (FIGS. 16A and 16B). In FIG. 17, the state molten metal 2 shown by a broken line shows a state before the electromagnetic force F ₁₀ acts, molten metal 2 shown by a solid line, in which the electromagnetic force F ₁₀ is acting Show. Others are the same as the seventh embodiment.

In the case of this example, the two conductor terminals 10
Can be melted equally and more reliably and joined to each other (FIG. 16B). In addition, it has the same function and effect as the seventh embodiment. The means for generating a magnetic field shown in the above-described seventh to ninth embodiments is not limited to the above-described method, but may be other means.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an arc welding method according to a first embodiment.

FIGS. 2A and 2B are perspective views of (A) conductive terminals arranged at a narrow pitch, (B) a partially enlarged view of (A) showing generation of molten metal, and (C) and (B) of Embodiment 2; Sectional drawing in plane A.

FIG. 3 is a perspective view illustrating an arc welding method according to a second embodiment.

FIGS. 4A and 4B are explanatory diagrams of a shape of a molten metal in a second embodiment when it is assumed that no electromagnetic force acts, and FIG.
Explanatory drawing of the shape of the molten metal controlled by the electromagnetic force.

5A is a perspective view showing a magnetic field generating means, and FIG. 5B is an explanatory view of magnetic field generation corresponding to a cross section taken along line BB in FIG.

FIG. 6 is a perspective view illustrating an arc welding method according to a third embodiment.

FIGS. 7A and 7B are explanatory diagrams of a shape of a molten metal when it is assumed that no electromagnetic force acts in the third embodiment, and FIG.
Explanatory drawing of the shape of the molten metal controlled by the electromagnetic force.

8A and 8B are explanatory diagrams showing a state in which adjacent conductor terminals are short-circuited when it is assumed that no electromagnetic force acts in the third embodiment, and FIG. 8B shows a state where welding is normally performed by being controlled by the electromagnetic force. FIG.

FIG. 9 is an explanatory diagram illustrating a method for controlling a molten metal in a fourth embodiment.

FIG. 10 is an explanatory diagram illustrating a method for controlling a molten metal in a fifth embodiment.

FIG. 11 is a diagram illustrating a time change of an arc current in a fifth embodiment.

FIGS. 12A and 12B are perspective views illustrating a magnetic field generation unit and an explanatory diagram of magnetic field generation corresponding to a cross section taken along line CC of FIGS.

13A is a perspective view illustrating an arc welding method according to a seventh embodiment, and FIG. 13B is a perspective view illustrating a state after welding.

14A and 14B are explanatory diagrams showing a state after (A) just before joining a molten metal and (B) after welding in a seventh embodiment.

15A is a perspective view illustrating an arc welding method, and FIG. 15B is a perspective view illustrating a state after welding in an eighth embodiment.

FIG. 16 is a perspective view showing (A) an arc welding method and (B) a state after welding in Embodiment 9;

FIG. 17 is an explanatory diagram illustrating a method for controlling a molten metal in the ninth embodiment.

FIG. 18 is an explanatory view showing a shape of a molten metal and a short circuit of a conductor terminal in a conventional example.

FIG. 19 is a perspective view showing a state in which a conductor terminal is melted and separated in a conventional example.

[Explanation of Codes] . . Object to be welded, 10 . . 1. conductor terminal; . . 2. molten metal; . . Arc electrode, 4,41,42. . . Conductor, 5. . . Magnet, 51. . . N pole, 52. . . S pole, I. . . Arc current, I ₀ , I ₇ . . . Current, I ₁ , I ₂ . . . Induced current, H, H _{1 to} H ₁₁ . . . Magnetic field, F, F _{1 to} F ₁₁ . . . Electromagnetic force,

Continued on the front page (72) Inventor Mamoru Urushizaki 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Denso, Inc. (72) Inventor Takashi Ogata 1-1-1, Showa-cho, Kariya-shi, Aichi F-term in Denso, Inc. (Reference) 4E081 YN10 4E082 HA03

Claims (20)

[Claims] 1. An arc welding method for melting and joining an object to be welded by arc discharge, wherein the object to be welded generates a magnetic field in a molten metal portion, and the magnetic field is generated by an electric interaction between the magnetic field and an arc current. An arc welding method comprising applying an electromagnetic force to a molten metal and performing welding while controlling the shape of the molten metal. 2. The method according to claim 1, wherein the object to be welded is
An arc welding method, wherein two or more sets are conductor terminals arranged adjacent to each other. 3. The method according to claim 1, wherein the magnetic field is:
An arc welding method characterized in that the arc current is generated concentrically on a plane substantially orthogonal to an arc current, with the center of the welding object as a center. 4. The magnetic field according to claim 3, wherein a large number of conductors are arranged around the object to be welded, and a current corresponding to an arc current is caused to flow through the conductors so as to concentrically surround the molten metal portion. An arc welding method characterized in that the arc welding is performed. 5. The magnetic field according to claim 1, wherein the magnetic field is:
An arc welding method, wherein the welding is simultaneously performed in directions opposite to each other in the molten metal part. 6. The arc welding method according to claim 5, wherein the magnetic field is generated in the molten metal portion by forming a multipolar yoke using a magnet. 7. The method according to claim 1, wherein the magnetic field comprises:
An arc welding method characterized in that an arc current is generated in the molten metal part by an induced current generated by a change in the arc current. 8. The arc welding method according to claim 7, wherein the induced current is generated by arranging a conductor around the object to be welded and generating the induced current in the conductor. 9. The method according to claim 1, wherein:
The object to be welded is two conductor terminals arranged via a predetermined clearance. At least one of the conductor terminals is melted by the arc discharge, and the molten metal is melted by the electromagnetic force. An arc welding method comprising welding the two conductor terminals while generating the magnetic field so that the molten metal extends toward the other conductor terminal. 10. The arc electrode according to claim 9, wherein the arc electrode for performing the arc discharge is disposed at a position corresponding to a substantially middle point between the two conductor terminals, and both of the two conductor terminals are simultaneously subjected to the arc discharge. Arc welding method characterized by melting by the following. 11. The method according to claim 9, wherein the arc electrode is disposed at a position close to one of the two conductor terminals, and the conductor terminal is mainly melted by arc discharge. Characterized arc welding method. 12. The arc electrode according to claim 9, wherein the arc electrodes are arranged one by one at positions corresponding to each of the two conductor terminals, and the two arc terminals melt the two conductor terminals by arc discharge. Arc welding method. 13. An arc welding apparatus for melting and joining an object to be welded by arc discharge, the arc welding apparatus having a magnetic field generating means for generating a magnetic field in a molten metal portion where the object to be welded is melted. An electromagnetic force generated by an electric interaction between the magnetic field and the arc current generated by the magnetic field generating means is applied to the molten metal, and welding is performed while controlling the shape of the molten metal. Arc welding equipment. 14. The arc welding apparatus according to claim 13, wherein the welding object is a conductor terminal in which two or more sets are adjacently arranged. 15. The magnetic field generating means according to claim 13, wherein the magnetic field generating means generates the magnetic field on a plane substantially orthogonal to the arc current and concentrically around a central portion of the welding object. An arc welding apparatus, which is arranged. 16. The method according to claim 15, wherein the magnetic field generating means comprises a plurality of conductors arranged around the object to be welded, and a current corresponding to an arc current is caused to flow through the conductors, so that An arc welding apparatus configured to generate a magnetic field concentrically. 17. The magnetic field generating means according to claim 15, wherein said magnetic field generating means comprises a plurality of magnets disposed around said welding object, and said magnets generate a magnetic field concentrically in said molten metal portion. An arc welding apparatus characterized by the above-mentioned. 18. The magnetic field generating means according to claim 13, wherein the magnetic field generating means is a multipolar yoke formed by using a magnet, and is configured to simultaneously generate a magnetic field in a direction opposite to the molten metal portion. An arc welding apparatus characterized by the above-mentioned. 19. The magnetic field generating means according to claim 13 or 14, wherein said magnetic field generating means comprises a conductor arranged around said welding object, and said magnetic field is generated by said induced current generated in said conductor with a change in arc current. An arc welding apparatus characterized in that it is generated in a molten metal part. 20. The welding terminal according to claim 13, wherein the object to be welded is two conductor terminals arranged via a predetermined clearance, and at least one of the conductor terminals is one of the conductor terminals. Are melted by the arc discharge, and the two conductor terminals are welded while generating a magnetic field by the magnetic field generating means so that the molten metal melt is extended toward the other conductor terminal by the electromagnetic force. An arc welding apparatus characterized in that: