电极形状对AA5182铝合金电阻点焊性能的影响
Study of electrode tip morphology on the performance in resistance spot welding of AA5182 aluminum alloy
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摘要: 采用自主设计的球面电极(spherical electrode, SE)进行铝合金的电阻点焊研究，从电极寿命、裂纹抑制及接头拉剪载荷三个方面，比较其与普通平端面电极(flat electrode, FE)对AA5182铝合金电阻点焊性能影响的差异，并结合SORPAS模拟结果验证和分析了产生这种差异的机理. 结果表明，针对AA5182铝合金中频直流电阻点焊，采用这种自主设计的SE电极所得的焊点拉剪载荷总体较高，裂纹风险因子也较小(SE:0.105～0.110, FE:0.148～0.152)，焊点的裂纹呈现短而小的特征，电极寿命明显优于FE电极.Abstract: This literature presented a self-designed spherical electrode (SE) used in resistance spot welding AA5182 aluminum alloy. Researches were carried out to study the difference on the performance of the weld compared to custom flat electrode (FE) through conducting tensile shear test, electrode life test and cracking analysis. SORPAS simulation was also conducted to verify and study the mechanism which caused these discrepancies in tensile strength, electrode life and cracking prohibition. According to both experimental and simulation results, it was preferable to adopt such self-designed SE in resistance spot welding AA5182 aluminum alloy when using median frequency spot welding machine, in which the cracking risk factor (CRF) was lower (SE:0.105～0.110, FE:0.148～0.152) and related cracking was smaller and shorter. What’s more, the electrode life was worse when using FE.
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Keywords:
- electrode morphology /
- tensile shear strength /
- cracking /
- electrode life
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