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Aluminum-alloy resistance spot welding method for filling chromium-powder tempering nugget strength

A technology of resistance spot welding and aluminum alloy, applied in the direction of resistance welding equipment, welding medium, welding equipment, etc., can solve the problems of low solder joint strength, large welding current, difficulty in resistance spot welding, etc., and achieve inhibition of recovery and recrystallization, Improve the strength of solder joints and achieve the effect of microstructure

Inactive Publication Date: 2007-11-21
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the good electrical and thermal conductivity of aluminum alloy, its surface often has a layer of dense oxide film, and its melting point temperature is more than three times the melting point temperature of aluminum alloy, which brings the resistance spot welding of aluminum alloy materials. great difficulty
Compared with ordinary carbon steel spot welding, aluminum alloy spot welding not only needs to use a larger welding current, the time is short, but also the strength of the welding spot is low, the welding quality is difficult to control, and it is far from meeting the requirements of continuous production, which seriously affects The application of aluminum alloy in the automotive industry, home appliances, aerospace and other fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Take two 30×10×0.8mm aluminum alloy plates, soak them in a 10% NaOH solution with a mass concentration of 10 minutes, then clean the surface of the aluminum alloy plate with clean water, and then put the aluminum alloy plate into HNO with a mass concentration of 10% 3 Soak in the solution for 10 minutes, clean the surface of the aluminum alloy plate with clean water and dry it. On the surface-treated aluminum alloy plate, determine 3 solder joints with a distance of 10mm between every two solder joints along a straight line. The welding area of ​​each solder joint 18mm 2 ,According to 0.0016g / mm on each welding spot between two aluminum alloy plates 2 Coated with chromium powder, using a copper electrode with an end face diameter of 4.5mm, and performing resistance spot welding with a welding current of 14000A, a welding time of 100ms and a welding pressure of 3000N. The tensile forces of the three solder joints are: 1333.26N, 1350.27N and 1385.021N

Embodiment 2

[0010] Take two 30×10×0.8mm aluminum alloy plates, soak them in 10% NaOH solution with mass concentration for 10 minutes, then clean the surface of the aluminum alloy with clean water, and then put the aluminum alloy plates into HNO with 10% mass concentration 3 Soak in the solution for 10 minutes, clean the surface of the aluminum alloy with clean water and dry it. On the surface-treated aluminum alloy plate, determine 3 solder joints with a distance of 10mm between every two solder joints along a straight line. The welding area of ​​each solder joint is 18mm. 2 ,According to 0.0023g / mm on each solder joint between two aluminum alloy plates 2 Coated with chromium powder, using copper electrodes with an end face diameter of 4.5mm, and resistance spot welding with a welding current of 14000A, a welding time of 100ms and a welding pressure of 3000N. The tensile forces of the three solder joints are: 1833.42N, 1887.14 and 1902.59 N.

Embodiment 3

[0012] Take two 30×10×0.8mm aluminum alloy plates, soak them in 10% NaOH solution with mass concentration for 10 minutes, then wash the aluminum alloy surface with clean water, and then put the aluminum alloy plates into HNO with 10% mass concentration 3 Soak in the solution for 10 minutes, clean the surface of the aluminum alloy with clean water and dry it. On the surface-treated aluminum alloy plate, the distance between each two solder joints is 10mm along a straight line, and 3 solder joints are determined, and the welding area of ​​each solder joint is 18mm. 2 , According to 0.004g / mm on each welding spot between two aluminum alloy plates 2 Coated with chromium powder, using copper electrodes with an end face diameter of 4.5mm, and resistance spot welding with a welding current of 14000A, a welding time of 100ms and a welding pressure of 3000N. The tensile forces of the three solder joints are: 1198.36N, 1213.25N and 1287.58.N.

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Abstract

The invention is concerned with aluminum alloy resistance spot welding method with filled chrome powder to melody the intension of melting core, belonging to aluminum alloy resistance spot welding technology. Dip the aluminum alloy plate into the NaOH liquid and clear with water and dip the plate into HNO3 liquid and clear with water and airing. Spread filled chrome powder at the welding spot of the two disposed aluminum alloy plate and carry the spot welding to the aluminum alloy plate with copper electrode with certain current, welding time and welding pressure. The method adds chrome powder in the core forming process of the resistance spot welding to form tiny compound spot of chrome powder among the metals and to restrain the restore and recrystallization of aluminum alloy. It refines the structure of melting core of aluminum alloy by enhancing the welding intension to over 2500 N.

Description

Technical field: [0001] The invention relates to an aluminum alloy resistance spot welding method filled with chromium powder quenched and tempered nugget strength, belonging to aluminum alloy resistance spot welding technology. Background technique [0002] As we all know, resistance spot welding is one of the most important processing methods in the production of aluminum alloy sheets. However, because aluminum alloy has good electrical and thermal conductivity properties, its surface often has a dense oxide film, and its melting point is more than 3 times the melting point of aluminum alloy, which brings about resistance spot welding of aluminum alloy materials. Great difficulties. Compared with ordinary carbon steel spot welding, aluminum alloy spot welding not only requires a larger welding current and shorter time, but also has a lower welding joint strength. The welding quality is difficult to control, and it is far from meeting the requirements of continuous production, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/11B23K11/34B23K35/04B23K103/10
Inventor 罗震李青松单平王军董安
Owner TIANJIN UNIV
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