期刊
出版社
ASME
DOI: 10.1115/1.4055374
关键词
resistance spot welding; asymmetric weld nugget; aluminum alloy; multi-ring domed (MRD) electrode; microstructure; coach peel; electrode degradation; welding and joining
This study investigates the effect of sheet surface condition, electrode surface morphology, electrode material, weld schedule, and electrode tip condition on asymmetric nugget growth, as well as the resulting weld microstructure and coach peel strength in resistance spot welding of aluminum alloys. It was found that asymmetric nugget growth was most influenced by sheet surface conditions and electrode materials at the positive polarity electrode side, leading to reduced weld mechanical strength and toughness.
Resistance spot welding of aluminum alloys (Al RSW) is known to be very challenging, in part due to the undesirable and hard-to-predict asymmetric growth of the weld nugget. In this paper, two 1.2 mm thick AA6022-T4 aluminum alloy sheets were joined by RSW using multi-ring domed (MRD) electrodes to experimentally investigate the effect of sheet surface condition, electrode surface morphology, electrode material, weld schedule, and electrode tip condition on asymmetric nugget growth, as well as the resulting weld microstructure and coach peel strength. It was found that asymmetric nugget growth was most strongly influenced by sheet surface conditions and electrode materials at the positive polarity electrode side. The asymmetric nuggets exhibited a smaller nugget angle in relation to the faying surface and a wider partially melted zone (PMZ) in the sheet adjacent to the negative electrode which reduced weld mechanical strength and toughness. In addition, the asymmetric nugget growth also caused asymmetric electrode/workpiece interaction.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据