JPH04362A - Method and apparatus for surface reforming of metallic parts - Google Patents

Abstract

PURPOSE:To attain surface reform without welding defects by irradiating the surface with high density energy to melt it and then carrying out built-up welding with heat-resisting element. CONSTITUTION:A part 11 to be reformed is heated with TIG arc by using a TIG torch 12 to form a molten layer 19 by the irradiation of high density energy. Immediately after that, the build-up welding of heat-resisting element is carried out by using a plasma welder 13 to form an alloyed layer 20, which can be molten again by the high energy source. These processes are repeated twice to add the heat-resisting element. By this method, the added amount of heat-resisting element is increased, and the uniformized structure of alloyed layer having no defects is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for surface modification of metal parts using high-density energy.

[Prior art and its problems] In recent years, there has been a demand for technology for partially strengthening (surface modification) metal parts such as aluminum casting parts.

As a background to this, for example, in the field of automobile parts,
As engine output increases, there is a problem in that aluminum casting or cast iron cylinder heads are subject to an increase in mechanical load as well as thermal load due to temperature rise.

That is, as shown in FIG. 12, due to such an increase in load, the lower surface 2 of the cylinder head 1, especially the area between the intake boat 3 and the exhaust boat 4, which is relatively thinner than other parts (between the valves), is ), and the portion 6 between these and the fuel injection nozzle hole (or pre-combustion chamber hole) 5, thermal cracks occur.

Further, as shown in FIG. 13, in the piston 7, the area around the combustion chamber 8 (indicated by diagonal lines in the figure), which is subject to a large load, should be strengthened.

Remelting is a new technique for modifying the surface of such areas, and there are reports that it has achieved a certain degree of improvement in heat resistance (
Kanazawa, Miyake and 2 others, Development of valve gap reinforced aluminum alloy cylinder head by TIG remelting, Toyota Technology, vo137
No. 2 (1987), P112-119)
.

Various studies have been conducted on "alloy remelting treatment" in order to further enhance heat resistance and other properties than this remelting treatment. The technical contents and the challenges faced by each are as follows.

■TIG welding method: At the same time as TIG remelting, heat-resistant metal powder is fed into the TIG arc using a powder supply device. In this method, the amount of heat-resistant metals and alloys added is 1 by volume.
If the addition amount is less than 0%, the effect of improving heat resistance is small, and the amount added is large, the gas released from the base material (aluminum casting) will be trapped in the molten pool, causing gas defects.

■Electron beam method: A heat-resistant metal is placed on the surface of the object to be modified in advance and then melted.

In this case, processing under reduced pressure is required, and if powder is used as the heat-resistant metal, it will scatter during reduced pressure, so it is necessary to coat the object to be processed with powder metal in advance using a thermal spraying method.

Naturally, therefore, the processing cost will be high. Furthermore, the method of supplying heat-resistant metal powder and welding wire is complicated.

■Laser method: Unlike electron beams, there is no need for reduced pressure, and processing can be performed in the atmosphere. When remelting an alloy into an aluminum casting using a laser, it is necessary that the added metal element has the color of black thread, and at the same time, it is necessary to apply a black coating to the treated part of the object to be treated. Furthermore, the equipment is expensive.

■Plasma welding method: It can be considered the same as TIG, but the depth of weld penetration is 20 to 30% shallower compared to TIG. Moreover, if the amount added is increased, it has the same drawbacks as TIG.

That is, each of the conventional alloy remelting treatment methods has its own drawbacks, and it is difficult to say that the method can actually be adopted.

Therefore, the present invention was devised to provide a method and apparatus for surface modification of metal parts that can increase the amount of heat-resistant elements added, is inexpensive, and is free from welding defects such as gas defects.

[Means and Effects for Solving the Problems] In the present invention, a region to be modified is melted by irradiation with high-density energy, and then a heat-resistant element is added by overlay welding.

Further, in the present invention, after melting the portion to be modified by irradiation with high-density energy, a heat-resistant element is added by overlay welding, and the portion is further melted again using a high-density energy source.

Further, in the present invention, after melting the region to be modified by irradiation with high-density energy, the heat-resistant element is repeatedly added at least twice by overlay welding.

Then, in the present invention, after melting the part to be modified by irradiation with high-density energy, heat-resistant elements are repeatedly added at least twice by overlay welding, and then re-melted with a high-density energy source. It is something.

It is desirable that the build-up welding be performed using capsule particle powder in which core particles of a heat-resistant element are coated with metal particles.

Further, in the present invention, immediately after melting a portion to be modified such as the surface of an aluminum casting with a high-density energy source, overlay welding is performed using a MIG welding method using a wire containing a heat-resistant element as an electrode. .

It is preferable that the build-up welding be performed using a composite wire in which a sheath material is filled with capsule particles in which core particles of a heat-resistant element are coated with metal particles.

Furthermore, in the present invention, a composite wire is formed by filling a sheath material with capsule particles in which a core particle of a heat-resistant element is coated with metal particles, and this composite wire is used as a filler material to fill the part to be modified. After the build-up welding, build-up welding is performed using a welding wire made of heat-resistant steel.

At least one of these build-up welds is desirably performed by MIG welding.

In the present invention, a composite wire is formed by filling a sheath material with capsule particles in which core particles of a heat-resistant element are coated with metal particles, and high-density energy is irradiated to the part to be modified. After melting, MI using composite wire as filler material
Overlay welding is performed using the G welding method, and then overlay welding is performed using the MIG welding method using a welding wire made of heat-resistant steel.

It is desirable that the high-density energy is a TIG arc.

The present invention also provides an apparatus for carrying out the above method,
a first welding mechanism for irradiating high-density energy to a region to be modified; a second welding mechanism provided behind the first welding device in the welding direction and performing build-up welding using a heat-resistant element; It is biased.

Furthermore, the present invention includes a first welding mechanism for irradiating high-density energy to a region to be modified, and a second welding mechanism provided at the rear of the first welding device in the welding direction to perform overlay welding using a heat-resistant element. Second welding 8! 1 structure, and a third welding mechanism that is provided behind the second welding mechanism in the welding direction and irradiates high-density energy.

The second welding mechanism may include two welding machines arranged in series.

Moreover, it is desirable that the first welding mechanism is a TIG welding torch.

Furthermore, it is desirable that the second welding mechanism is a MIG welding machine.

[Example] Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, with reference to FIG. 1, a first embodiment of a surface modification method for metal parts according to the present invention and an apparatus for surface modification of metal parts, which is a device for carrying out the method, will be described.

This surface modification method involves melting the surface 11 of a cylinder head made of cast aluminum, which is a portion to be modified, by irradiating it with high-density energy, and then adding a heat-resistant element by overlay welding. This surface modification device includes a first welding mechanism for irradiating high-density energy to the region 11 to be modified, and a heat-resistant element installed behind the first welding device in the welding direction A. The second welding mechanism performs build-up welding.

In this embodiment, Ni fine powder is used as the heat-resistant element, a TIG welding torch 12 is used as the first welding mechanism, and a plasma welding 1 is used as the second welding mechanism.
1113 is used.

The TIG welding torch 12 is a device for performing TIG welding, and is formed with an electrode 14 for generating an arc and a nozzle 15 for spouting an inert gas G for shielding.

The plasma welding machine 13 includes an electrode (tungsten rod) 16 for emitting an arc, an inner nozzle 17 that surrounds the electrode (tungsten rod) and ejects working gas, and an outer nozzle 18 for supplying fine powder B.
It consists of: Then, the inner nozzle 17 and the working gas restrict the arc to increase the energy density, and the fine powder B is sprayed onto the base material to perform overlay welding (thermal spraying).

When surface modification is performed using this device, the TIG torch 12 and the plasma welding machine 13 are separated from each other by a predetermined distance and are moved in the welding direction A along the surface 11 of the part.
move it to

With this, a molten layer 19 is formed on the surface 11 by heating with the TIG arc, and immediately after that, the plasma arc is applied to build up the alloyed layer 2 to which a desired amount of Ni powder has been added.
0 will be formed.

At this time, by heating with the TIG arc, minute gases (porosity defects) that cause blowholes are eluted from the base material, so even if the amount added is large, gas defects will not occur. That is, it contains a large amount of Ni, for example 15
% or more, it is possible to obtain a highly concentrated alloyed layer 20 consisting of an additive amount of % or more.

Further, due to the residual heat effect of the TIG arc, welding cracks caused by the plasma arc can be prevented and the weld penetration can be deepened.

In addition to the TIG torch 12 of this embodiment, an electron beam, laser, plasma, or the like can be used as the first welding mechanism that irradiates high-density energy.

In addition to Ni, heat-resistant elements include Cr and M.

Heat-resistant metals such as Furthermore, capsule particles composed of particles of different substances may be used.

In producing these capsule particles, as shown in FIG. The sample is placed in a container equipped with a 16.0 O Orpl rotary blade (centrifugal transfer device), and impact force by airflow is applied for 1 to 10 minutes. Due to this impact action, the aluminum particles 22 firmly adhere to the Ni particles 21, and as shown in FIG. is obtained. A large number of these capsule particles are then aggregated to form a powder containing a heat-resistant element (see FIG. 4).

By using powder of such capsule particles 25,
The outer side of the alloyed layer 2o becomes homogeneous aluminum, which improves the compatibility with the aluminum base material, and allows uniform mixing of Ni and aluminum, which contributes to improving the quality of the alloyed layer 20.

The heat-resistant elements used in the core of capsule particles include:
Ni is better than other heat-resistant metals (Cr, Co, M
o), or AJ 20 s.

Ceramic particles such as SiC, Six N4, and CuO may also be used. In addition to aluminum, metals compatible with aluminum (Cu, Cu alloy, etc.) may be used as the coated particles.

Next, a second embodiment of the present invention will be described with reference to FIGS. 5 to 7.

In this embodiment, the first and second welding mechanisms arranged in the same manner as in the first embodiment irradiate high-density energy to melt, and then heat-resistant elements are added by overlay welding. , a TIG welding torch 31 is used for the first welding mechanism, and a MIG welding 832 is used for the second welding mechanism.

The MIG welding machine 32 is equipped with a nozzle 33 for blowing out shielding gas G and a wire feeding device 34 for sequentially feeding out welding wire, and performs arc welding with the wire being consumed.

In this embodiment, the composite wire 35 containing the capsule particles 25 shown in the first embodiment is used as the wire.

In manufacturing this composite wire 35, as shown in FIG. 6, powder of capsule particles 35 is filled into the hollow portion of a sheath material (pipe) 36 made of a stretched aluminum material. This pipe 36 is then drawn to form a composite wire 35 having a diameter of 0.8 to 1.61 mm, as shown in FIG. The steps after filling the capsule particles 25 into the composite wire 35 are performed using a known flux-cored wire (f lux
-caredwire).

Then, the TIG welding torch 31 is placed first, followed by the MIG welding torch 31.
By overlaying welding by welding 8132, a molten layer 19 is formed on the surface 11 to be modified, and the composite wire 3
An alloyed layer 37 to which a heat-resistant element (Ni) is added is obtained by the droplets of No. 5.

This surface 11 is covered with oxides (Aj, Os) 38 that become an obstacle when performing MIG welding, but the preceding T
This is destroyed by the IG arc, and a new layer of base material (aluminum) comes to the surface, making it possible to build up by MIG welding. In other words, the advantage of MIG welding is that it has a high welding speed without prior cutting, and gas is eluted during the remelting process, which prevents blowholes caused by porosity and defects, resulting in alloying without welding defects. A layer 37 can be formed.

Then, due to the residual heat effect of the TIG arc, the base material (aluminum)
This improves the compatibility with the wire and prevents welding cracks.
In addition, it is possible to deepen the melting depth.

Further, in this embodiment, since the composite wire 35 is manufactured from the powder of the capsule particles 25 having the Ni core 23, the occurrence of weld cracks can be prevented. In other words, in the molten layer 19, Ni is uniformly dispersed and arranged as particles in the aluminum matrix, which ensures compatibility with the aluminum alloy casting, so that cracks can be avoided when filling only with heat-resistant metal. The following factors are eliminated.

Therefore, the restriction on the concentration of the added heat-resistant element is significantly relaxed, and the diameter of the heat-resistant element particles in the capsule particles 25 (
By changing the ratio (to the aluminum particle diameter), an arbitrary concentration can be obtained.

Further, by using the composite wire 35, the electrical resistance during welding becomes uniform. This is because when producing a mixture of heat-resistant element particles and aluminum particles, it is difficult to mix them uniformly.

Therefore, due to the non-uniformity of the mixed particles, electrical resistance increases in the length direction of the wire, making it extremely difficult to perform stable weld build-up.

This embodiment prevents such difficulties from occurring.

In addition to aluminum pipes, the sheath material 36 may be made of a ductile metal (copper, etc.) that is compatible with aluminum.
It doesn't matter what you use.

Further, its shape (cross section) is not limited to that shown in FIG. 7, and may be of any shape as long as it can be filled with the powder of the capsule particles 25. For example, various shapes used in flux cored wires may be used. You can choose from.

Next, a third embodiment of the present invention will be described with reference to FIG.

In this surface modification method, the region 11 to be modified is melted by irradiation with high-density energy, then a heat-resistant element is added by overlay welding, and the region 11 is further melted again using a high-density energy source. The surface modification device further irradiates high-density energy to the rear of the TIG welding torch 41 as the first welding mechanism and the MIG welding machine 42 as the second welding mechanism, which are arranged in the same manner as in the second embodiment. A third welding mechanism is provided and configured.

In this embodiment, a TIG welding torch 43 is used as the third welding mechanism.

Therefore, the molten layer 44 is formed by the preceding TIG welding torch 41, and then the alloyed layer 45 is formed by overlay welding using the composite wire 35 by the MIG welding machine 42, and then again by the TIG welding torch 43. It will melt.

By doing so, the alloyed layer 45 to which a large amount of heat-resistant element (Ni) is added and which is free of welding defects can be made into a high-quality remelted alloy layer 46 with uniform fiber composition. .

Next, a fourth embodiment of the present invention will be described with reference to FIG.

In this surface modification method, a composite wire similar to that shown in the second and third embodiments is used as a filler material, and after overlay welding is performed on the area to be modified, a welding wire made of heat-resistant steel is 5
1 is used for overlay welding.

In this embodiment, the part to be modified is the intervalve part 52 of the cast iron cylinder head, and the composite wire 53 is the C
It is formed by filling a Cu pipe with capsule particles in which O is used as a core particle and surrounded by Cu coated particles. Further, as a device for carrying out this method, a configuration in which two MIG welding machines 54 and 55 are arranged in series is used.

Therefore, the composite wire 53 is set in the front MIG welding machine 54, and the MIG equipped with the welding wire 51 made of heat-resistant steel is
By moving the IG welding 8154 along the surface 52 of the valve gap of the cylinder head while maintaining a predetermined distance in the welding direction Af&, build-up welding is first performed using the composite wire 53 as a filler material. That is, a heat-resistant alloy layer 56 to which CO is appropriately added is formed in the region 52.

Immediately after this build-up, the rear MIG weld 1
155, overlay welding is performed on the portion 52, and as a result, a second heat-resistant alloy layer 57 made of heat-resistant steel is further deposited on top of the first heat-resistant alloy layer 56 made of capsule particles.

In this way, capsule particles made of Co as a core and surrounded by Cu are filled into a Cu pipe to form a composite wire 53, and this composite wire 53 is used as a filler material to build up the corresponding part, and then a heat-resistant steel pipe is filled. Since the welding wire 51 is used for overlaying, the preceding overlaying process provides a residual heat effect for the next process of overlaying the heat-resistant steel, improving weldability and reducing Co
The concentration of heat-resistant steel can be increased, and the heat-resistant strength can be significantly improved.

Furthermore, the precipitation of cementite and the occurrence of cracks that conventionally occur with overlay welding of cast iron parts can be prevented.

That is, since the Co of the first heat-resistant alloy layer 56 is surrounded by Cu, it does not come into contact with cast iron, and furthermore, cementite is hardly precipitated in the alloyed layer, and even if it is, the amount is extremely small. Since it is limited, there is no risk of weakening or decrease in rigidity.

Furthermore, since Co is uniformly dispersed and arranged as particles in the Cu matrix, which has high compatibility with cast iron, the causes of cracking when overlaying with only heat-resistant metal are alleviated, and welding defects are reduced. A healthy reinforcement layer is obtained. The first heat-resistant alloy layer 56 functions to buffer the cast iron and the second heat-resistant alloy layer, thereby preventing welding from occurring.

Furthermore, since MIG, which has a high welding speed, is used for build-up welding, it can be provided as a highly productive and extremely practical local strengthening method.

In addition to the above-mentioned combination of Co-Cu, various other capsule particles can be considered, and heat-resistant elements such as Cr, M
o, etc., or SiC, Cub.

Ceramic particles such as AJ 203 and Sis N4 may also be used. In addition to Cu, the coating particles and sheath material may be any metal that is compatible with cast iron.

Next, a fifth embodiment of the present invention will be described with reference to FIG.

This surface modification method involves melting the region 61 to be modified by irradiating high-density energy, and then repeatedly adding a heat-resistant element at least twice by overlay welding. The addition is performed by build-up welding using the composite wire 53 of the fourth embodiment as a filler metal, and subsequent build-up welding using the welding wire 51 made of heat-resistant steel.

That is, the apparatus for implementing this includes a TIG welding torch 62 as a first welding mechanism, and two MIG welding machines 63 and 64 arranged in series as a second welding mechanism.

With this device, first, TI using the TIG welding torch 62 is performed.
A molten layer 65 is formed by a G arc, and a first heat resistant alloy layer 66 in which Co is appropriately dispersed and added to the molten layer 65, and a second heat resistant alloy added with heat resistant steel placed on top of the first heat resistant alloy layer 66. Layer 67 will be formed.

By doing so, even when aluminum alloy castings are used, preliminary cutting is not required, and it is possible to significantly improve heat resistance and prevent cracking.

Furthermore, the melting caused by the TIG arc becomes residual heat from build-up welding, resulting in deeper weld penetration and further improvement in weldability.

The combination of wires in the second welding mechanism is not limited to composite wire + heat-resistant steel wire, but also heat-resistant steel + composite in this order, or heat-resistant conditioned heat-resistant steel, composite wire composite, etc. in which similar wires are stacked together. I can also think of doing that.

Further, as the welding wire 51 made of heat-resistant steel in the fourth and fifth embodiments, the following can be used.

5LIS304 series, JIS Z 3321 Y2O2
, Y308LSUS309 series...JIS Z 332
1 Y2O2, Y309LSIJS316 series, JIS
Z 3321 Y316 Y316LNi series...^
AS^5.14 ERNi-1 Inconel series-AIAS
A5.14 ERNiCr-3 Next, a sixth embodiment of the present invention will be described with reference to FIG.

This surface modification method involves melting the region 71 to be modified by irradiating it with high-density energy, then repeatedly adding heat-resistant elements at least twice by overlay welding, and then re-applying it with a high-density energy source. It is something that melts. The surface modification device includes two MIG welding machines 73 and 74 arranged in series, one on top of the TIG welding torch as the first welding mechanism and the second on the second welding mechanism as shown in the fifth embodiment. The third welding mat is a TIG welding torch 5 provided on one side.

Therefore, first, a molten layer 76 is formed by TIG arc by the TIG welding torch 71, and this molten layer 76 is
A first heat-resistant alloy layer 78 to which CO is appropriately dispersed and added by overlaying with a composite wire 77, and a first heat-resistant alloy layer 78 with CO added thereto using a welding wire 79 made of heat-resistant steel. A second heat resistant alloy layer 80 is formed, and this second heat resistant alloy layer 80 will be remelted by the TIG welding torch 74.

By doing so, the heat-resistant strength is significantly strengthened, and the remelted heat-resistant alloy layer 81 with a uniform structure is formed.

In the first to sixth embodiments described above, a TIG welding torch is used as the welding mechanism for melting, and a plasma welding machine or MI is used as the welding mechanism for adding the heat-resistant element.
Although the G welding machine is shown, various other combinations are possible. The applicable welding mechanisms (welding methods) are summarized in Table 1.

Table 1 ○...Suitable △...Applicable but productivity is not good ×...Not applicable Also, the following are the advantages of adopting each welding method shown in the table.

TIG: Plasma that is inexpensive and has deep penetration; Electron beam that can easily supply powder; Laser that can deepen the alloyed layer; MIG that can deepen the alloyed layer; Fast welding speed [Effects of the invention] In summary, the present invention According to the invention, the following excellent effects are exhibited.

(1) According to the method and apparatus described in rII Items 1 and 12, it is possible to increase the amount of heat-resistant elements added and achieve surface modification without welding defects such as gas defects.

(2) According to the method and apparatus described in M claims 2 and 13,
The amount of heat-resistant elements added can be increased, there are no welding defects, and the alloyed layer structure can be made uniform.

(3) According to the method and apparatus according to claims 3 and 14,
Welding defects can be prevented and heat resistance strength can be significantly improved.

(4) According to the method and apparatus according to claims 4 and 14,
Welding defects are prevented, heat-resistant strength is significantly improved, and the alloyed layer structure is made more uniform.

(5) M According to the methods described in Items 5 and 7, further prevention of welding defects and uniformity of welding can be achieved.

(6) According to the method described in item 6, it is possible to form a highly heat-resistant alloyed layer that does not require cutting and has no welding defects.

(7) According to the method described in claim 8, a significant improvement in heat resistance strength can be achieved, and a heat resistant alloy layer that is sound and has good weldability can be formed.

(8) According to the method described in item 9, the welding speed can be further increased and productivity can be improved.

(9) According to the method described in claim 10, it is possible to form an alloyed layer which does not require cutting in advance, has no welding defects, and has higher heat resistance.

(10) According to the method of claim 11, it is possible to further deepen the melt penetration of build-up welding at low cost.

(11) According to the apparatus according to claim 15, an alloyed layer with deep welding penetration can be obtained by overlay welding at low cost.

(12) According to the apparatus according to claim 16, the welding speed can be increased, and productivity can be improved.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing a first embodiment of the method and apparatus for surface modification of metal parts according to the present invention, and Fig. 2 shows the manufacturing process of capsule particles applied to the powder. 3 is a cross-sectional view of the produced capsule particles; FIG.
The figure is a configuration diagram of the powder that is an aggregate thereof, Figure 5 is a side sectional view showing the second embodiment of the present invention, and Figure 6 is a perspective view showing the manufacturing process of the composite wire applied to the wire. Figure, 7th
8 is a side sectional view showing a third embodiment of the present invention, FIG. 9 is a side sectional view showing a fourth embodiment of the present invention, and FIG. FIG. 10 is a side sectional view showing a fifth embodiment of the present invention, FIG. 11 is a side sectional view showing a sixth embodiment of the present invention, and FIG. 12 is a side sectional view showing a sixth embodiment of the present invention. The bottom view of the cylinder head, FIG. 13, is also a perspective view of the piston. In the figure, 11 is a part to be modified, 12 is a TIG welding torch which is a first welding mechanism, 13 is a plasma welding machine which is a second welding mechanism, 25 is a capsule particle, and 32 is another second welding mechanism. A MIG welding machine, 35 is a composite wire, 43 is a TIG welding torch which is a third welding mechanism, and 51 is a welding wire made of heat-resistant steel. Ward C) Figure 11 Figure 10 Procedural Amendment (Voluntary) January 7, 1991 Director General of the Patent Office Toshi Uematsu 1, Indication of Case Patent Application No. 2-139677 2, Name of Invention Metallic Parts Surface modification method and device 3, relationship with the case of the person making the amendment Patent applicant <017) Isuzu Motors Co., Ltd. 4, agent postal code 105 1-6-7 Atago, Minato-ku, Tokyo Procedural amendment ( January 7, 1991 Toshi Uematsu, Commissioner of the Japan Patent Office1, Indication of Case Patent Application No. 2-1396772, Title of Invention Method and Apparatus for Surface Modification of Metallic Parts3, Person Making Amendment Relationship to the case Patent applicant (017) Isuzo Jidosha Co., Ltd. 4 Agent postal code 105 1-6-7-5 Atago, Minato-ku, Tokyo Date of amendment order Voluntary 6 Drawings to be amended (all drawings) 7. Contents of the amendment: engraving of the drawings (no change in content) 8. Attached documents spontaneously 6. Specification to be amended (detailed description of the invention column) and Figure 11 of the drawings 7
, Contents of the amendment (1) "rTIG welding torch 71" on page 26 of the specification, line 4, is correct. (2) ``rTIG welding torch 74'' on page 26, line 11'' is ``rTIG welding torch''. (3) Figure 11 of the drawings has been corrected as shown in the attached sheet. 8. Attached documents (1) One copy of drawings

Claims (16)

[Claims] 1. A method for surface modification of metal parts, which comprises melting a region to be modified by irradiation with high-density energy, and then adding a heat-resistant element by overlay welding. 2. A method for surface modification of metal parts, characterized by melting the part to be modified by irradiation with high-density energy, adding a heat-resistant element by overlay welding, and then remelting with a high-density energy source. . 3. A method for surface modification of metal parts, which comprises melting a region to be modified by irradiation with high-density energy, and then repeatedly adding a heat-resistant element at least twice by overlay welding. 4. A metal characterized by melting the part to be modified by irradiating it with high-density energy, then repeatedly adding a heat-resistant element at least twice by overlay welding, and then remelting it with a high-density energy source. Method for surface modification of system parts. 5. 5. The method for surface modification of metal parts according to claim 1, wherein the overlay welding is performed using capsule particle powder in which core particles of a heat-resistant element are coated with metal particles. 6. A metal part characterized by overlay welding using a MIG welding method using a wire containing a heat-resistant element as an electrode immediately after melting a part to be modified such as the surface of an aluminum casting with a high-density energy source. surface modification method. 7. 7. The overlay welding is performed using a composite wire in which a sheath material is filled with capsule particles in which core particles of a heat-resistant element are coated with metal particles. surface modification method for metal parts. 8. A composite wire is formed by filling capsule particles in which core particles of a heat-resistant element are coated with metal particles into a sheath material, and the composite wire is used as a filler material to build up and weld to the area to be modified. A method for surface modification of metal parts, characterized by overlay welding using a welding wire made of heat-resistant steel. 9. 9. The method for surface modification of metal parts according to claim 8, wherein at least one of the build-up welds is performed by MIG welding. 10. A composite wire is formed by filling a sheath material with capsule particles in which a core particle of a heat-resistant element is coated with metal particles, and after irradiating the area to be modified with high-density energy to melt it, A method for surface modification of metal parts, characterized in that overlay welding is performed by MIG welding using the composite wire as a filler material, and then overlay welding is performed by MIG welding using a welding wire made of heat-resistant steel. . 11. The method for surface modification of metal-based parts according to any one of claims 1 to 10, wherein the high-density energy is a TIG arc. 12. a first welding mechanism for irradiating high-density energy to a region to be modified; and a second welding mechanism provided behind the first welding device in the welding direction and performing build-up welding using a heat-resistant element. A surface modification device for metal parts, characterized by comprising: 13. a first welding mechanism for irradiating high-density energy to a region to be modified; and a second welding mechanism provided behind the first welding device in the welding direction and performing build-up welding using a heat-resistant element. A surface modification device for metal parts, comprising: a third welding mechanism that is provided behind the second welding mechanism in the welding direction and irradiates high-density energy. 14. 14. The surface modification apparatus for metal parts according to claim 12 or 13, wherein the second welding mechanism comprises two welding machines arranged in series. 15. The surface modification apparatus for metal parts according to any one of claims 12 to 14, wherein the first welding mechanism is a TIG welding torch. 16. The surface modification apparatus for metal parts according to any one of claims 12 to 15, wherein the second welding mechanism is a MIG welding machine.