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Abstract: To improve electrode life of resistance spot welding of
aluminum alloy LF2, the deep cryogenic treatment technology of
electrodes is put forward. Electrodes are treated by deep cryogenic
treatment with different deep cryogenic treatment parameters. Deep
cryogenic treatment electrodes life experiment is carried out and the
experimenal results are compared with the non-deep cryogenic treatment
electrodes life experiment ones. The properties of the deep cryogenic
treatment electrodes and the non-deep cryogenic treatment electrodes are
tested. The SEM area scanning and the SEM back scattering of electrodes
are carried out. The grain degree of deep cryogenic treatment electrodes
and the non-deep cryogenic treatment electrodes are tested by X-ray
diffraction. The reason of deep cryogenic treatment improving electrode
life for resistance spot welding of aluminum alloy is studied. The
experimental results show that deep cryogenic treatment makes Cr, Zr in
deep cryogenic treatment electrodes emanate dispersedly and makes the
grain of deep cryogenic treatment electrodes smaller than non-cryogenic
treatment ones, so that the electrical conductivity and the thermal
conductivity of deep cryogenic treatment electrodes are improved very
much , which make electrode life for spot welding aluminum alloy improve
from 620 to 2 145 .
Key words: Cryogenic treatment Aluminum alloy Spot welding
Electrode life
CLC No: TG457
国家自然科学基金(50175080)、中国博土后基金(2004035146)和教育部高等学校博士学科专项科研基金(2005612)资助项目.
Received 20040409, received in revised form 20040913
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