Shield Nozzle and Contact Tip

Abstract

To provide a shield nozzle and a contact tip that never lose sputter sticking prevention effect for a long time and then enable long-time welding to improve welding efficiency, and can prevent a sputter from sticking and peel off a sticking sputter with weak force.SOLUTION: A metallic base material of a shield nozzle is provided with a plating coating, and after a blast treatment is performed on the plating coating, a coating of BN is provided. A base material of a contact chip made of electrically conductive metal is provided with a plating coating, and after a blast treatment is performed on the plating coating, a coating of BN is provided.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a shield nozzle and a contact tip used in a welding torch for gas shielded arc welding. [Background technology]

[0002] In gas-shielded arc welding, if spatter that flies off during welding adheres to the contact tip or metal shield nozzle, the gap between the contact tip and the shield nozzle narrows and insufficient shielding gas is supplied, making welding defects due to blowholes more likely to occur and requiring frequent removal of the spatter. Therefore, in the past, there have been methods that prevent spatter from adhering by applying a spatter adhesion prevention liquid, as described in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 03-085175 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned method, when attempting to weld several weld lines in succession, the anti-spatter adhesion liquid evaporates due to the high temperature during welding, and the effectiveness of the anti-spatter adhesion liquid is lost in a short period of time, so there was a problem that the anti-spatter adhesion liquid had to be applied each time the welding of each weld line was finished.

[0005] The present invention solves the above problems, and the spatter adhesion prevention effect is not lost for a long time, and long-term welding can be performed stably, and welding efficiency can be improved. Also, The object of the present invention is to provide a shield nozzle and a contact tip that are capable of peeling off adhering spatter with a weak force. [Means for solving the problem]

[0006] The shield nozzle of the present invention, which has been made to solve the above problems, is a shield nozzle for a gas-shielded arc welding torch that includes a contact tip that guides a welding wire and supplies a welding current to the welding wire, and a shield nozzle that encloses the contact tip and sprays shielding gas to the weld from a gap between the shield nozzle and the contact tip, and is characterized in that a plating coating is applied to the base material of the metallic shield nozzle, and then a blast treatment is applied to the plating coating, and then a BN coating is applied.

[0007] Furthermore, the contact tip of the present invention is a contact tip for a gas-shielded arc welding torch that guides a welding wire and supplies a welding current to the welding wire, and that includes a shield nozzle that encloses the contact tip and sprays shielding gas to the weld from a gap between the shield nozzle and the contact tip, in which a plating film is applied to the base material of the contact tip made of a conductive metal, and then a blast treatment is performed on the plating film and then a BN coating is applied, and this is the invention according to claim 2. Effect of the Invention

[0008] In the invention of claim 1, a plating film is applied to the base material of the metallic shield nozzle, and then a blast treatment is applied to the plating film, after which a BN coating is applied. This means that the spatter adhesion prevention effect is not lost for a long time, and welding can be performed stably for a long time, improving welding efficiency. Also, The attached spatter can be peeled off with a weak force, eliminating the risk of damaging the surface during peeling. Greatly extend life It can be stretched.

[0009] In the invention of claim 2, a plating film is applied to the base material of the conductive metal contact tip, and then a blast treatment is applied to the plating film, after which a BN coating is applied. This prevents the spatter adhesion prevention effect from being lost for a long time, allows stable welding for a long time, and improves welding efficiency. Also,The attached spatter can be peeled off with a weak force, eliminating the risk of damaging the surface when peeling off. Contact Tip of Greatly extend life Can be stretched do. In addition, because the BN coating is hard, there is no risk of the tip of the insertion hole being deformed by the movement of the welding wire, which further extends the life of the contact tip. [Brief description of the drawings]

[0010] [Figure 1] 1 is a cross-sectional view showing an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view of a contact tip. [Diagram 3] FIG. 3 is an enlarged view of part A in FIG. 2. [Figure 4] FIG. 2 is a cross-sectional view of a shield nozzle. [Diagram 5] FIG. 5 is an enlarged view of part B in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, preferred embodiments of the present invention will be described with reference to FIGS. 1 is made of copper alloys such as copper, chromium copper, and beryllium copper, which have excellent electrical conductivity. Become The contact tip 1 is a contact tip with a tapered tip, and the contact tip 1 has an insertion hole 1a formed therein for inserting the welding wire 2 in the axial direction, and a mounting portion 1b having a screw thread formed on the outer peripheral surface of the protruding portion at the base end.

[0012] As shown in FIG. 3, the surface of the base material 1c of the contact tip 1 made of conductive metal is coated with a nickel boron plating film 1d, and the plating film 1d is then coated with a blasting treatment 1e. Coating Agent (hereinafter referred to as BN coat) coating film 1f Carried out is.

[0013] Reference numeral 3 denotes a tip holder made of a copper alloy such as copper, chromium copper, or beryllium copper having excellent electrical conductivity. The tip holder 3 has an insertion hole 3a through which the welding wire 2 is inserted in the axial direction, and at its tip, a mounting portion 3b is formed with a threaded portion on its inner surface to which the mounting portion 1b at the base end of the contact tip 1 is screwed and which holds the contact tip 1. A mounting portion 3c is formed with a threaded portion on its outer surface at the base end. In addition, a plurality of gas supply ports 3d are formed in the middle for supplying shielding gas such as carbon dioxide gas, or a mixture of argon gas and carbon dioxide gas or oxygen gas.

[0014] Reference numeral 4 denotes an insulator, the tip portion of which is formed with an attachment portion 4a having a screw groove cut into its outer peripheral surface, and the base end portion is formed with an attachment portion 4b having a screw portion cut into its inner peripheral surface which is screwed into the attachment portion 3c of the chip holder 3.

[0015] 5 is made of copper, copper alloys, etc. Become It is a cylindrical shield nozzle, and has an attachment portion 5a with a screw groove formed on the inner surface of the base end portion. The attachment portion 5a of the base end portion is screwed into the attachment portion 4a at the tip portion of the insulator 4, and contains the contact tip 1 and the tip holder 3 with the tip of the contact tip 1 protruding.

[0016] As shown in FIG. 5, the shield nozzle 5 has a base material 5b made of metal on the surface of which a nickel chrome plating film 5c is applied as a plating film, and a blasting treatment 5d is applied to this plating film 5d, followed by a BN coating film 5e.

[0017] The BN coating films 5e, 1f applied on the plating films 5c, 1d of the shield nozzle 5 and the contact tip 1 are formed by applying a BN coating and baking and drying after blasting 5d, 1e on the base materials 5b, 1c on which the plating films 5c, 1d have been applied. The BN coating films 5e, 1f can be used stably up to 900°, are hard, and have poor wettability for long periods of time, so they suppress the adhesion of spatter, and even if they do adhere, the adhesion is weak.

[0018] still, BN coating 5e, 1f For example, in the above embodiment, the shield nozzle 5 having an outer diameter of 20 mm, an inner diameter of 16 mm, and a length of 73 mm has the coating applied 53 mm from the tip on the outer surface and 20 mm from the tip on the inner surface, and the contact tip 1 has the coating applied on the outer surface and the tip surface.

[0019] As described above, according to the present invention, the base material 5b of the metallic shield nozzle 5 is plated with the plating film 5c, the plating film 5c is blasted with the blasting treatment 5d, and then the BN coating is applied. Coating 5e Since this treatment is applied, the spatter adhesion prevention effect is not lost for a long time, and stable welding can be performed for a long time, improving welding efficiency. Also, The attached spatter can be peeled off with a weak force and there is no risk of damaging the surface during peeling, so the life of the shield nozzle 5 can be significantly extended.

[0020] In addition, according to the present invention, the base material 1c of the contact tip 1 is coated with a plating film 1d, and the plating film 1d is then subjected to a blasting treatment 1e, after which a BN coating film 1f is applied. This prevents the spatter adhesion prevention effect from being lost for a long time, allows stable welding for a long time, and improves welding efficiency. Also, Adhered spatter can be peeled off with a weak force, eliminating the risk of damaging the surface when peeling off, thereby significantly extending the life of the contact tip 1. Also, since the BN coating film is hard, there is no risk of the tip of the insertion hole 1a being deformed by the movement of the welding wire 2, so the life of the contact tip 1 can be further extended. [Explanation of symbols]

[0021] 1 Contact Tip 1b Mounting part 1c Base material 1d Plating film 1e Blasting 1f BN coating film 2. Welding wire 3 Chip holder 3a Mounting part 4 Insulator 5 Shield nozzle 5b Base material 5c Plating 5d blasting process 5e BN coating

Claims

1. A shield nozzle for a gas-shielded arc welding torch includes a contact tip that guides a welding wire and supplies a welding current to the welding wire, and a shield nozzle that encloses the contact tip, and which ejects shielding gas from a gap between the shield nozzle and the contact tip. The shield nozzle is characterized in that a plating film is applied to the base material of the metallic shield nozzle, and then a blasting treatment is performed on the plating film, followed by a paint film of BN coating.

2. A contact tip for a gas-shielded arc welding torch includes a contact tip that guides a welding wire and supplies a welding current to the welding wire, and a shield nozzle that encloses the contact tip, and in which shielding gas is sprayed to a weld from a gap between the shield nozzle and the contact tip, the contact tip being characterized in that a plating film is applied to a base material of the contact tip made of a conductive metal, and the plating film is then subjected to a blasting treatment and then a BN coating is applied.

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