Preparation method of deep narrow gap consumable electrode gas protection welding current contact nozzle

A technology of melting electrode gas and protective welding, applied in anodizing, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problems of difficult coating, influence on welding stability, peeling or cracking, etc., to improve friction and wear resistance And high temperature resistance, optimized working environment, good wear resistance

Inactive Publication Date: 2019-11-15
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that the above-mentioned patent mainly obtains Al by thermal spraying on the one hand. 2 o 3 Coating, however copper contact tip has good thermal conductivity, thermal sprayed Al 2 o 3 The coating is more difficult, and the bonding force between the coating and the copper substrate is small, and it is prone to local peeling or cracking, which has a certain impact on the welding stability; on the other hand, the contact tip is insulated by adding a ceramic shell to the surface of the contact tip. However, the insulating layer of this method is too thick, and the size of the electrode is increased, resulting in an increase in the width of the groove, which is not conducive to deep and narrow gap groove welding

Method used

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  • Preparation method of deep narrow gap consumable electrode gas protection welding current contact nozzle
  • Preparation method of deep narrow gap consumable electrode gas protection welding current contact nozzle
  • Preparation method of deep narrow gap consumable electrode gas protection welding current contact nozzle

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Experimental program
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Effect test

Embodiment 1

[0033] 1) A solid copper contact tip matching a narrow gap groove weld is obtained by mechanical processing, and the present invention can plate an aluminum oxide coating on a copper contact tip with a diameter of 3.2mm.

[0034] 2) The copper contact tip in step 1) is treated by solvent hot-dip aluminum plating:

[0035] First polish the copper surface with sandpaper until it is bright, then clean it with deionized water, then soak the copper surface with alcohol for 10 minutes, then clean it with deionized water, and finally, immerse the copper surface in 40°C, 15g / L H 2 SO 4 solution for 2 minutes, then quickly rinse with deionized water; and put in 80 ° C, 3% KF flux solution for 3 minutes, then take it out and quickly dry it, keep it warm for a certain period of time, immerse it in molten aluminum, hot dip The plating temperature is about 700°C, and the hot-dip plating time is 8s, so that the copper surface is coated with a sealed aluminum layer with a thickness of about...

Embodiment 2

[0041] 1) A solid copper contact tip matching a narrow gap groove weld is obtained by mechanical processing, and the present invention can plate an aluminum oxide coating on a copper contact tip with a diameter of 3.2mm.

[0042] 2) The copper contact tip in step 1) is treated by solvent hot-dip aluminum plating:

[0043] First polish the copper surface with sandpaper until it is bright, then clean it with deionized water, then soak the copper surface with alcohol for 6 minutes, rinse it with deionized water for 10 seconds, and finally, immerse the copper surface in 30°C, 10g / L H 2 SO 4 Put it in the solution for 1 minute, then quickly rinse it with deionized water; put it into the 70°C, 1% KF flux solution for 1 minute, then take it out and dry it quickly, after holding it for a certain period of time, immerse it in molten aluminum, hot dip The plating temperature is about 660°C, and the hot-dip plating time is 6s, so that the copper surface is coated with a sealed aluminum ...

Embodiment 3

[0049] 1) A solid copper contact tip matching a narrow gap groove weld is obtained by mechanical processing, and the present invention can plate an aluminum oxide coating on a copper contact tip with a diameter of 3.2 mm.

[0050] 2) The copper contact tip in step 1) is treated by solvent hot-dip aluminum plating:

[0051] First polish the copper surface with sandpaper until it is bright, then clean it with deionized water, then soak the copper surface with alcohol for 15 minutes, rinse it with deionized water for 10 seconds, and finally immerse the copper surface in 50°C, 50g / L H 2 SO 4 solution for 5 minutes, then quickly rinse with deionized water; and put it in 80 ℃, 10% KF flux solution for 5 minutes, then take it out and dry it quickly, after holding it for a certain period of time, immerse it in molten aluminum, hot dip The plating temperature is about 750°C, and the hot-dip plating time is 30s, so that the copper surface is coated with a layer of sealed aluminum layer...

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Abstract

The invention discloses a preparation method of a deep narrow gap consumable electrode gas protection welding current contact nozzle. A copper current contact nozzle is used as a substrate; the coppercurrent contact nozzle is treated through hot dip aluminum plating by means of a solvent method, an aluminum layer is plated on the surface of the copper current contact nozzle; and then in an electrolyte, the aluminum layer of the copper current contact nozzle is subjected to micro-arc oxidation, and the welding current contact nozzle with a high-temperature-resistant and insulated ceramic coating on the outer layer is obtained. The film layer of the current contact nozzle has the advantages of being thin, high in electrical resistivity, good in abrasion resistance and resistant to high temperature, the size limit of the insulation treatment of traditional narrow gap consumable electrode gas protection welding current contact nozzles is broken, application to welding of deep narrow gap groove joints can be achieved, and the welding efficiency is improved.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a method for preparing a conductive tip for gas-shielded welding with a deep narrow gap. Background technique [0002] Narrow gap welding has been successfully applied in some large and important structures, such as high-speed train body, thick-walled pressure vessel, boiler, large mechanical equipment, marine structure, ship hull construction and pressure pipeline, etc. Traditional MIG welding has large heat input and high cost. Narrow gap welding reduces the amount of filler metal and reduces costs; the welding heat input is low, and the mechanical properties of the weld are good; the deformation is small and easy to control. [0003] When welding in a deep and narrow groove, it is often necessary to penetrate the front end of the welding wire into the groove. The function of the contact tip is to ensure the straightness of the welding wire and generate an arc at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C23C2/12C23C2/02C25D11/06
CPCC23C2/02C23C2/12C23F17/00C25D11/026C25D11/06
Inventor 程乾
Owner SOUTHWEST JIAOTONG UNIV
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