Preparation method of deep and narrow gap gas metal arc welding contact tube

A technology of molten electrode gas and shielded welding, which is applied in the direction of anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc. It can solve the problems of difficult coating, influence of welding stability, shedding or cracking, etc., so as to improve the resistance to friction and wear And high temperature resistance, optimized working environment, good wear resistance

Active Publication Date: 2020-04-03
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 and narrow gap gas metal arc welding contact tube
  • Preparation method of deep and narrow gap gas metal arc welding contact tube
  • Preparation method of deep and narrow gap gas metal arc welding contact tube

Examples

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Effect test

Embodiment 1

[0033] 1) A solid copper contact tip matched with a narrow gap groove weld is obtained by machining, and the present invention can coat a copper contact tip with a diameter of 3.2 mm with an alumina coating.

[0034] 2) The copper contact tip in step 1) is treated with solvent hot-dip aluminizing:

[0035] First polish the copper surface with sandpaper until bright, then clean it with deionized water, then soak the copper surface in alcohol for 10 minutes, then clean it with deionized water, and finally, immerse the copper surface in 40℃, 15g / L H 2 SO 4 In the solution for 2 minutes, then quickly rinsed with deionized water; and placed in a 80 ℃, 3% KF plating flux solution for 3 minutes, then taken out and quickly dried, after holding for a certain period of time, immersed in molten aluminum, hot dipping The plating temperature is about 700 ℃, and the hot dip plating time is 8s, so that the copper surface is coated with a sealing aluminum layer with a thickness of about 10 μ...

Embodiment 2

[0041] 1) A solid copper contact tip matched with a narrow gap groove weld is obtained by machining, and the present invention can coat a copper contact tip with a diameter of 3.2 mm with an alumina coating.

[0042] 2) The copper contact tip in step 1) is treated with solvent hot-dip aluminizing:

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

Embodiment 3

[0049] 1) A solid copper contact tip matched with a narrow gap groove weld is obtained by machining, and the present invention can coat a copper contact tip with a diameter of 3.2 mm with an alumina coating.

[0050] 2) The copper contact tip in step 1) is treated with solvent hot-dip aluminizing:

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

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Abstract

The invention discloses a preparation method of a deep and narrow gap gas metal arc welding contact tube. A copper contact tube is used as a substrate; the copper contact tube is subjected to hot-dipaluminum plating treatment by adopting a solvent method to plate an aluminum layer on the surface of the copper contact tube; and then, in the electrolyte, the aluminum layer of the copper contact tube is subjected to micro-arc oxidation, and the welding contact tube with the outer layer provided with the high-temperature-resistant and insulating ceramic coating is obtained. The contact tube has the advantages of being small in film layer thickness, high in resistivity, good in abrasion resistance and resistant to high temperature, breaks through the size limitation of insulation treatment ofa traditional narrow-gap gas metal arc welding contact tube, can be applied to welding of a deep and narrow gap groove connector, and improves the welding efficiency.

Description

technical field [0001] The invention belongs to the technical field of welding, and in particular relates to a preparation method of a deep and narrow gap melting electrode gas shielded welding contact tip. Background technique [0002] Narrow gap welding has been successfully applied in some large and important structures, such as high-speed train bodies, thick-walled pressure vessels, boilers, large machinery and equipment, marine structures, ship hull construction and pressure piping. Traditional MIG welding has large heat input and high cost. Narrow gap welding reduces the amount of filler metal and reduces the cost; 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 deep and narrow grooves, it is often necessary to push the front end of the welding wire into the groove. The function of the contact tip is to ensure the straightness of the wire and generate an arc at th...

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 程乾朱宗涛李远星陈辉
Owner SOUTHWEST JIAOTONG UNIV
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