JP3995494B2 - Torch member for welding and manufacturing method thereof - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to, for example, a welding torch member for arc welding or TIG (Tungsten-Inert-Gas) welding and a method of manufacturing the welding torch member, and more particularly, a ceramic containing silicon (Si) on the surface of the welding torch member. The present invention relates to a device devised to suppress the adhesion and accumulation of spatter during welding and to enhance the heat insulating effect and the insulating effect by providing a layer.
[0002]
[Prior art]
For example, a welding torch for arc welding is generally configured as follows. First, there is a torch pipe. A tip body is attached to the tip side of the torch pipe, and a contact tip is attached to the tip side of the tip body. A shield nozzle is disposed on the outer peripheral side of the contact chip, and this shield nozzle is attached to the torch pipe via an insulator. An orifice is attached to the outer periphery of the connecting portion between the contact tip and the tip body. Further, a welding wire is fed to the center of the welding torch having such a configuration.
[0003]
According to the above configuration, the shield gas made of an inert gas such as argon gas or helium gas is supplied and injected to the welded portion through the annular gap between the contact tip and the shield nozzle. In this state, desired welding is performed while generating an arc between the welding wire protruding and arranged from the tip of the contact tip and the workpiece.
[0004]
Moreover, the welding torch for TIG welding has the following general configuration. First, there is a torch body, and a cylindrical portion is provided at the tip of the torch body. A sleeve is internally provided in the cylindrical portion, and a collet body is screwed and joined to the distal end side of the sleeve. A collet is inserted into the sleeve from the base end side. Another sleeve is screwed and joined to the base end side of the sleeve, and a torch cap is attached to cover the sleeve. Electrode rods are accommodated and arranged on the inner peripheral side of the collet and collet body.
[0005]
According to the above configuration, the shield gas made of an inert gas such as argon or helium supplied through the shield gas supply path of the torch body flows to the tip side through the annular gap between the collet body and the collet. Then, it flows out between the collet body and the nozzle through the shield gas outflow hole formed in the collet body, and is ejected from there to the welding site. In this state, an arc is generated between the electrode rod and the workpiece and desired heat is used to perform desired welding.
[0006]
By the way, in the case of a welding torch for arc welding, chromium (Cr) plating or the like is applied to the outer surface of the contact tip or shield nozzle. This is for suppressing spatter from adhering to the outer surface. However, even if such spatter adhesion prevention treatment is performed, for example, CO ₂ In welding, when continuous welding is performed under the welding conditions where the welding current is 350 A, the voltage is about 45 V, and the thickness of the welding wire is 1.4 mm, the contact tip or the shield nozzle is reached when about 15 minutes have passed since the start of welding. It has been reported that a considerable amount of spatter adheres to and accumulates on the outer surface of the steel. In particular, there is a problem that a considerable amount of spatter adheres and accumulates on the inner peripheral surface side of the shield nozzle, and as a result, the shield gas flow path is narrowed (in some cases, the shield gas flow path has an area). In some cases, the ratio was 50% or more. When the flow path of the shield gas is narrowed, the shielding effect by the shield gas is reduced, and the quality of welding is thereby lowered.
[0007]
In addition, when welding is further continuously performed from such a state, the amount of spatter adhesion / deposition increases further, and in extreme cases, the seal, the nozzle, and the inner periphery thereof are arranged. It is also anticipated that the gap between the contact tip and the contact gas chip will be closed, and the shield gas flow path will disappear. In this case, the shield gas cannot be supplied, and the shield nozzle and the contact tip are connected via the deposited and deposited spatter, so that the welding current flows to the shield nozzle side. It will be impossible.
Incidentally, the current flowing through the shield nozzle flows into a metal part or a human body around the welding torch, which is in a dangerous state.
[0008]
Therefore, before such a state is reached, welding is usually performed for about 15 minutes, and then the welding operation is temporarily stopped, the shield nozzle is removed from the welding torch, and the spatter adhering and depositing there is removed. Alternatively, a new shield gas nozzle is prepared, attached to the welding torch, and welding is started again.
[0009]
At the same time, various coating layers for preventing adhesion and deposition of spatters may be provided on the surface of a metal (for example, copper or copper alloy) base material that constitutes the contact tip or shield nozzle. Proposed.
For example, a fluororesin film is baked on the surface of a base material to form a release layer (Japanese Patent Laid-Open No. 51-116137), and a composite plating in which nickel and a fluororesin polymer compound are co-deposited on the surface of the base material With a layer (Japanese Examined Patent Publication No. 6-83900), with a nickel-chromium (Ni-Cr) alloy coated on the surface of the base material and then sprayed and coated with a ceramic material, followed by a polishing treatment (Japanese Patent Application No. 60-89610), in which the tip of the inner diameter of the nozzle on which the tip is mounted is tapered outward (Japanese Patent Laid-Open No. 7-256642), and a ceramic sintered body or the like is inserted. , Etc.
This kind of problem can be said not only in the case of a welding torch for arc welding but also in a welding torch for TIG welding.
[0010]
[Problems to be solved by the invention]
The conventional configuration has the following problems.
First, in any of the methods, it was not possible to obtain a sufficient effect in terms of preventing spatter adhesion / deposition.
In addition, when a part made of a ceramic sintered body is fitted, the cost increases.
In addition, in the case of arc welding, the welding current is set so as to increase as the consumable electrode increases. Therefore, when any of the above methods is employed, both heat generation and radiant heat increase and spatter adherence / There was a problem that the effect of preventing deposition was reduced.
In addition to these problems, for example, in the case of a welding torch having a plurality of electrodes, there is a problem that the insulation between the electrodes or between the torch members is impaired due to adhesion and deposition of spatter.
[0011]
The present invention has been made on the basis of the above points. The object of the present invention is to effectively prevent spatter adhesion and deposition, and has a high heat insulating effect and an electric insulating effect. It is providing the torch member and the manufacturing method of this torch member for welding.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, a welding torch member according to claim 1 of the present invention comprises a metal base material and a ceramic layer containing silicon (Si) provided on the surface of the base material. The ceramic layer containing (Si) is obtained by dispersing a polymer structure polymer in which a main chain of-(Si-C)-bond is crosslinked with-(O-Ti-O)-in an organic solvent and coating it. It is characterized by being fired.
According to a second aspect of the present invention, there is provided a welding torch member comprising: a metal base material; a metal plating layer provided on the surface of the base material; and a ceramic layer including silicon (Si) provided on the surface of the metal plating layer. And the ceramic layer containing silicon (Si) has a polymer structure polymer in which a main chain of — (Si—C) — bond is cross-linked with — (O—Ti—O) — as an organic solvent. Dispersed, coated, and fired.
A welding torch member according to claim 3 is the welding torch member according to claim 1 or 2, wherein the firing is performed at 300 to 600 ° C.
According to a fourth aspect of the present invention, there is provided a welding torch member according to the third aspect, wherein the initial firing process is performed at about 300 ° C.
A welding torch member according to claim 5 is the welding torch member according to claim 3 or 4, wherein the final firing treatment is performed using heat generated during welding.
A welding torch member according to claim 6 is: The welding torch member according to claim 1, The metal base material is a contact tip or tip body for arc welding, a torch pipe, or a collet body for TIG welding.
A welding torch member according to claim 7 is: The welding torch member according to claim 2, The metal base material is a contact tip or tip body for arc welding, a torch pipe, or a collet body for TIG welding.
A welding torch member according to claim 8 is the welding torch member according to any one of claims 1 to 5, wherein the welding torch member is a shield nozzle for arc welding or a shield nozzle for TIG welding. It is characterized by being.
According to a ninth aspect of the present invention, there is provided a method for producing a welding torch member, wherein a ceramic layer containing silicon (Si) is provided on a surface of a metal substrate, and at that time, a main chain of-(Si-C) -bonding. The polymer structure polymer crosslinked with-(O-Ti-O)-is dispersed in an organic solvent, then coated, and then baked.
According to a tenth aspect of the present invention, there is provided a method for manufacturing a welding torch member, wherein a metal plating layer is provided on a surface of a metal substrate, and then a ceramic layer containing silicon (Si) is provided on the surface of the metal plating layer. In this case, a polymer structure polymer in which a main chain of — (Si—C) — bond is crosslinked with — (O—Ti—O) — is dispersed in an organic solvent, and then coated, and then baked. It is characterized by doing so.
A method for producing a welding torch member according to claim 11 is characterized in that, in the method for producing a welding torch member according to claim 9 or 10, the firing is performed at 300 to 600 ° C. To do.
According to a twelfth aspect of the present invention, there is provided a method for manufacturing a welding torch member according to the eleventh aspect, wherein the initial firing process is performed at about 300 ° C.
A method for manufacturing a welding torch member according to claim 13 is the method for manufacturing a welding torch member according to claim 11 or claim 12, wherein the final firing process is performed using heat generated during welding. To do.
[0013]
That is, the welding torch member according to the present invention comprises a metal base material and a ceramic layer containing silicon provided on the surface of the base material, and by providing such a ceramic layer, It effectively prevents spatter adhesion and deposition and obtains a high heat insulation effect and electrical insulation effect.
In addition, as a metal which comprises a base material, copper or a copper alloy can be considered, for example.
A welding torch member according to claim 2 is a metal base material, a metal plating layer provided on the surface of the base material, a ceramic layer containing silicon provided on the surface of the metal plating layer, Similarly, by providing such a ceramic layer, it is possible to effectively prevent adhesion and deposition of spatters and obtain a high heat insulating effect and electric insulating effect.
At this time, the ceramic layer containing silicon (Si) is obtained by dispersing a polymer structure polymer in which a main chain of — (Si—C) — bond is crosslinked with — (O—Ti—O) — in an organic solvent, Baked after coating it Has become .
Moreover, it is possible to perform the said baking at 300-600 degreeC.
It is also conceivable to perform the initial firing process at about 300 ° C.
In addition, it is conceivable to perform the final firing using heat generated during welding.
Further, as a target welding torch member, a contact tip for arc welding, a tip body for arc welding, a collet body for TIG welding, a shield nozzle for TIG welding, and the like are assumed.
Needless to say, the target welding torch member is not limited thereto.
Claims 9 ~ Claim 13 Is claimed as a method for producing a welding torch member.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a configuration of a welding torch for arc welding according to the present embodiment, and FIG. 2 is an enlarged cross-sectional view showing a portion II in FIG.
First, there is a handle portion 1, and a curved torch pipe 3 is connected to the handle portion 1. The outer periphery of the torch pipe 3 is covered with a heat-shrinkable insulating tube 5. A connection fitting 7 is screwed and joined to the rear end (right end in FIG. 1) of the handle portion 1, and another connection fitting 9 is provided on the side of the front end side (left end in FIG. 1) of the handle portion 3. Are joined. A welding cable (not shown) is connected to the connection fitting 7, and a shield gas supply hose (not shown) is connected to the connection fitting 9.
[0015]
A tip body 13 is screwed and joined to the tip side of the torch pipe 5, and an insulator 15 made of an insulating material is screwed and joined to the outer peripheral side of the tip body 13. A contact tip 17 is screwed and joined to the tip of the tip body 13, and a ceramic orifice 19 is installed on the outer periphery of the joint between the tip body 13 and the contact tip 17. Further, a shield nozzle 21 is disposed on the outer peripheral side of the contact chip 17, and this shield nozzle 21 is joined to the insulator 15 already described through a sleeve 23.
[0016]
Further, a tube 25 is internally provided on the inner peripheral side of the handle portion 1, the torch pipe 3 and the tip body 13 already described, and a welding wire 27 is passed through the tube 25. The front end of the welding wire 27 protrudes and is arranged by a predetermined amount from the front end of the contact tip 17. Further, a plurality of shield gas outflow holes 13 a are formed at the tip of the tip body 13. The orifice 19 is also provided with a plurality of shield gas outflow holes 19a.
[0017]
According to the above configuration, first, shield gas supplied from a shield gas supply hose (not shown) flows into the handle portion 1 through the connection fitting 9. The shield gas that has flowed into the handle 1 passes through the annular gap between the torch pipe 3 and the tube 25 and the annular gap between the tip body 13 and the tube 25, and passes through the shield gas outflow hole 13 a of the tip body 13. Then, it flows out between the tip body 13 and the orifice 19, and then flows out between the orifice 19 and the shield nozzle 21 through the shield gas outflow hole 19 a of the orifice 19. From there, it is injected toward the welding site through the outer periphery of the contact tip 17. Then, in a state where the welding site is shielded by the shielding gas, predetermined welding is performed while an arc is generated between the welding wire 27 and an object to be welded (not shown).
In FIG. 1 and FIG. 2, the flow of shield gas is indicated by arrows.
[0018]
Next, some of the parts already described will be described in more detail.
First, the shield nozzle 21 includes a copper alloy base 31 as shown in FIG. The copper alloy here is, for example, chromium copper, chromium / zirconium copper, beryllium copper, or the like.
The base material 31 may be made of copper, or may be made of another metal other than copper and a copper alloy.
A metal plating layer 33 is provided on the outer surface of the substrate 31. The metal plating layer 33 here is, for example, a hard chrome plating layer. A ceramic layer 35 containing silicon (Si) is provided on the outer surface of the metal plating layer 33. First, by providing the ceramic layer 35, adhesion and volume of spatter during welding are suppressed, and heat insulation performance and insulation performance are improved.
[0019]
The metal plating layer 33 is provided between the ceramic layer 35 and the base material 31 for the following reason. That is, at the time of welding, the surface of the base material 31 is oxidized to form an oxide layer. Such an oxide layer is expected to be peeled off from the base material 31 together with the ceramic layer 35 because of its low adhesion to the base material 31. Therefore, by providing the metal plating layer 33, the surface of the base material 31 is prevented from being oxidized, and as a result, the ceramic layer 35 is prevented from peeling from the base material 31.
[0020]
The ceramic layer 35 containing silicon (Si) is provided through the following process. First, a polymer structure polymer in which a main chain of — (Si—C) — bond is cross-linked with — (O—Ti—O) — is dispersed in an organic solvent. Next, it is coated on the surface of the metal plating layer 33 of the shield nozzle 21 by dipping or brushing. And a baking process is performed at 300 to 600 degreeC. Specifically, as an example, it is conceivable that the initial firing process is performed at approximately 300 ° C., and then the final firing process is performed using heat generated during welding. As a result, the resin component of the organometallic polymer evaporates, leaving only the ceramic layer 35 containing silicon (Si).
In addition, it is also conceivable that all the processing including the final baking is performed in advance.
In addition, titanium (Ti) is used to obtain the ceramic layer 35 containing silicon (Si). However, it is also possible to use zirconium (Zr), aluminum (Al), or the like.
[0021]
Further, the contact chip 17 has a structure in which a ceramic layer 43 containing silicon (Si) is directly provided on the outer surface of a base 41 made of copper or copper alloy as shown in FIG. . First, as the above-described copper alloy, for example, chromium copper, chromium-zirconium copper, beryllium copper, and the like are conceivable as in the case of the shield nozzle 21 described above. Further, by providing the ceramic layer 43, the spatter adhesion and volume during welding are suppressed, and the heat insulating performance and the insulating performance are improved. Further, in the case of the contact tip 17, a metal plating layer is not provided between the ceramic layer 43 and the base material 41. However, this is a shielding gas in which the surface of the contact tip 17 exhibits an antioxidant effect during welding. The reason is that the oxidation as in the case of the shield nozzle 21 already described does not matter so much.
[0022]
Next, the outer peripheral surface of the tip portion of the chip body 13 is coated with a ceramic layer (not shown) containing silicon (Si) as in the case of the contact chip 17. is there.
[0023]
As described above, according to the first embodiment, the following effects can be obtained.
First, in the shield nozzle 21 and the contact tip 17, it is possible to effectively suppress spatter adhesion / deposition. This is because the ceramic layers 35 and 43 containing silicon (Si) are provided. In other words, the provision of the ceramic layers 35 and 43 makes it difficult for the molten metal and the like scattered during welding to adhere to and deposit on the shield nozzle 21 and the contact tip 17.
The same applies to the chip body 13. Further, the slightly adhered / deposited spatter can be easily peeled off after that, so that the welding operation can be started by a simple cleaning operation at regular time intervals. It is possible to solve the problem that the cleaning work is forced or a new part needs to be replaced.
In addition, by providing the ceramic layers 35 and 43 in the shield nozzle 21 and the contact chip 17, it is possible to exert a heat insulating effect and an insulating effect. In addition, since the heat insulation effect is exhibited, the temperature difference between the spatter that scatters and the shield nozzle 21, the contact chip 17 and the like is increased, thereby improving the adhesion and deposition effect of the spatter. The above-mentioned action / effect can be further enhanced.
In addition, leakage of welding current can be prevented due to high electrical insulation, thereby improving safety.
[0024]
In the first embodiment, the surface of the torch pipe 3 is covered with the heat-shrinkable insulating tube 5, but silicon (Si) is used instead of the heat-shrinkable insulating tube 5. You may make it provide the ceramic layer containing.
[0025]
Next, a second embodiment of the present invention will be described with reference to FIG. In the case of the first embodiment, the arc welding welding torch has been described as an example, but in the case of the second embodiment, a TIG welding welding torch is described as an example. Is. Details will be described below.
[0026]
First, there is a torch body 101, and a cylindrical portion 103 is provided at the tip of the torch body 101. A sleeve 105 is housed inside the cylindrical portion 103. A collet body 107 is screwed and joined to the distal end side of the sleeve 105.
[0027]
A collet 109 is inserted into the sleeve 105 from the base end side. Another sleeve 111 is screwed and joined to the base end side of the sleeve 105, and a torch cap 113 is attached so as to cover the sleeve 111. On the inner peripheral side of the collet 109 and the collet body 107, an electrode rod 115 is accommodated and arranged.
[0028]
A tapered portion 107 a is formed on the inner peripheral side of the collet body 107. On the other hand, another tapered portion 109a is formed on the outer peripheral side of the collet 109 as well. Then, by attaching the torch cap 113, the collet 109 is pressed against the collet body 107 side. A slit portion (not shown) of the collet 109 is narrowed by the action of the taper portions 107a and 109a, whereby the electrode rod 115 is fixed.
[0029]
According to the above configuration, the shield gas made of an inert gas such as argon or helium supplied via the shield gas supply path 101 a of the torch body 101 is inserted through the annular gap between the collet body 107 and the collet 109. It flows out to the side, flows out between the collet body 107 and the nozzle 117 through the shield gas outflow hole 107b formed in the collet body 107, and is ejected from there toward the welding site. In this state, an arc is generated between the electrode rod 115 and a workpiece to be welded (not shown), and desired welding is performed using the heat.
[0030]
In the welding torch having the above configuration, the shield nozzle 117 is provided with a metal plating layer on the outer surface of a copper or copper alloy base material, as in the case of the shield nozzle 21 described in the first embodiment. In addition, a ceramic layer containing silicon (Si) is provided on the outer surface. First, by providing the ceramic layer, adhesion and deposition of spatter during welding are suppressed, and heat insulation performance and insulation performance are improved. The reason why the metal plating layer is provided between the ceramic layer and the base material is to prevent inadvertent peeling of the ceramic layer from the base material.
[0031]
Further, the collet body 107 is provided with a ceramic layer containing silicon (Si) on the outer surface of a copper or copper alloy base material as in the case of the contact chip 17 in the first embodiment. It has a configuration. First, by providing the ceramic layer, spatter adhesion during welding is suppressed and heat resistance is improved.
[0032]
Therefore, the same effects as those of the first embodiment can be obtained, for example, spatter adhesion and deposition can be suppressed.
[0033]
The present invention is not limited to the first and second embodiments.
First, the illustrated welding torch is merely an example, and it can be considered that it is applied to various welding torches. Further, it is arbitrary as to which welding torch member of the welding torch members constituting each welding torch the present invention is applied.
Moreover, as a base material of each welding torch member, various metals can be considered besides copper or a copper alloy. Further, the material and thickness of the metal plating layer and the thickness of the ceramic layer containing silicon are not particularly limited.
[0034]
【The invention's effect】
As described above in detail, according to the welding torch member and the method of manufacturing the same according to the present invention, first, it is possible to effectively suppress the adhesion and accumulation of spatter in the welding torch member. This is because a ceramic layer containing silicon is provided.
Moreover, by providing the ceramic layer containing silicon, a heat insulating effect and an insulating effect can be exhibited.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of an arc welding torch according to a first embodiment of the present invention.
FIG. 2 is a diagram showing a first embodiment of the present invention, and is a cross-sectional view showing an II part of FIG. 1 in an enlarged manner.
FIG. 3 is a cross-sectional view showing a configuration of a shield nozzle of an arc welding torch, showing the first embodiment of the present invention.
FIG. 4 is a cross-sectional view showing the configuration of the contact tip of the arc welding torch, showing the first embodiment of the present invention.
FIG. 5 is a cross-sectional view showing a configuration of a TIG welding torch, showing a second embodiment of the present invention.
[Explanation of symbols]
1 Handle part
3 Torch pipe
5 Insulated tube
13 Chip body
15 Insulator
17 Contact chip
19 Orifice
21 Shield nozzle
31 Shield nozzle base material
33 Metal plating layer of shield nozzle
35 Ceramic layer of shield nozzle
41 Contact tip base material
43 Ceramic layer of contact chip
101 torch body
103 cylindrical part
105 sleeve
107 collet body
109 collet
111 sleeve
113 Torch Cap
115 electrode bar

Claims (13)

A metal base, and a ceramic layer containing silicon (Si) provided on the surface of the base;
The ceramic layer containing silicon (Si) is obtained by dispersing a polymer structure polymer in which a main chain of — (Si—C) — bond is crosslinked with — (O—Ti—O) — in an organic solvent, and coating it A torch member for welding characterized by being fired after being fired. A metal base material, a metal plating layer provided on the surface of the base material, and a ceramic layer containing silicon (Si) provided on the surface of the metal plating layer,
The ceramic layer containing silicon (Si) is obtained by dispersing a polymer structure polymer in which a main chain of — (Si—C) — bond is crosslinked with — (O—Ti—O) — in an organic solvent, and coating it A torch member for welding characterized by being fired after being fired. In the welding torch member according to claim 1 or 2,
The welding torch member, wherein the firing is performed at 300 to 600 ° C. The welding torch member according to claim 3,
A torch member for welding, wherein the initial firing process is performed at approximately 300 ° C. In the welding torch member according to claim 3 or 4,
A welding torch member, wherein the final firing process is performed using heat generated during welding. The welding torch member according to claim 1,
A welding torch member, wherein the metal base material is a contact tip or tip body for arc welding, a torch pipe, or a collet body for TIG welding. The welding torch member according to claim 2,
A welding torch member, wherein the metal base material is a contact tip or tip body for arc welding, a torch pipe, or a collet body for TIG welding. In the welding torch member according to any one of claims 1 to 5,
The welding torch member is a shield nozzle for arc welding or a shield nozzle for TIG welding.   A ceramic layer containing silicon (Si) is provided on the surface of a metal substrate, and the main chain of — (Si—C) — bond is crosslinked with — (O—Ti—O) —. A method for producing a welding torch member, characterized in that a molecular structure polymer is dispersed in an organic solvent, then coated, and then fired.   A metal plating layer is provided on the surface of a metal substrate, and then a ceramic layer containing silicon (Si) is provided on the surface of the metal plating layer. In this case, a main chain of-(Si-C) -bonding is provided. Of a polymer structure polymer crosslinked with-(O-Ti-O)-is dispersed in an organic solvent, then coated, and then fired. Method. In the manufacturing method of the welding torch member according to claim 9 or 10,
A method for manufacturing a welding torch member, wherein the firing is performed at 300 to 600 ° C. In the manufacturing method of the torch member for welding according to claim 11,
A method for manufacturing a welding torch member, wherein the initial firing process is performed at approximately 300 ° C. In the manufacturing method of the welding torch member according to claim 11 or 12,
A method for producing a welding torch member, wherein the final firing treatment is performed by using heat generated during welding.

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