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Method for cryogenic treatment of aluminium alloy resistance spot welding electrode

A technology of cryogenic treatment and resistance spot welding, applied in the direction of electrode characteristics, welding medium, welding equipment, etc., to achieve the effects of low development cost, increased working life, and improved surface quality of solder joints

Inactive Publication Date: 2003-08-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been no reports on the use of cryogenic electrodes—that is, electrodes that have been processed by cryogenic treatment and have undergone changes in structure and performance—in resistance spot welding of aluminum alloys.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment

[0022] 1. Take 3 pairs / group of cryogenically treated electrodes and 3 pairs / group of electrodes that have not been cryogenically treated;

[0023] 2. The electrode materials are Cu-Cd and Cu-Zr respectively;

[0024] 3. Spot-welded aluminum alloy: the aluminum alloy LF2 cleaned by pickling method is used.

[0025] 4. Process parameters of spot welding: spot welding current 20000A, welding time 0.08s, electrode pressure 2500N, water flow 3 liters / minute;

[0026] 5. See Table 2 for the comparison results of the working life of the spot welding cryogenic electrode of the present invention and the spot welding electrode of the prior art.

[0027]

Electrode type

Working life (number of solder joints)

Electrodes not cryogenically treated

cryogenic electrode

cryogenic electrode

Cu-Cd

180

300

about 2 times

Cu-Zr

275

600

about 2 times

[0028] The above examples show that after the cr...

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PUM

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Abstract

A process for deep cold treatment of spot-welding electrode for Al alloy includes putting the Cu alloy electrodes in a container full of deep cold treating medium in a deep cold treater layer by layer, setting up parameters, deep cold treating, and restoring their temp to ordinary temp naturally. Its advantages are long service life elongated by once or more, no splash on welding and high welding quality.

Description

technical field [0001] This invention relates to methods of altering the physical structure of non-ferrous alloys. Background technique [0002] With the rapid development of the global automobile industry, the energy crisis and environmental pollution have become urgent problems to be solved in various countries. The world is advocating green engineering and sustainable development strategies. In order to reduce energy consumption and environmental pollution, the development of light cars has become one of the important trends in the development of the automobile industry. The use of aluminum alloy body is one of the important measures to reduce the weight of automobiles. [0003] Aluminum and aluminum alloys have the advantages of high specific strength, corrosion resistance and good deformation ability in the atmospheric environment. In many fields, especially in the fields of automobile manufacturing, home appliances and aerospace, the use of alu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/30B23K35/04C22F1/08
Inventor 吴志生单平廉金瑞胡绳荪刘翠荣
Owner TIANJIN UNIV
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