This study addresses issues relevant to resistance spot welding of AA5xxx and AA6xxx dissimilar aluminium alloys. Welding parameters are optimised to provide the maximum lap-shear strength and the largest nugget size. As mechanical properties of the weld are affected by the characteristics of the heat-affected zone as well as the fusion zone, microscopic analysis was performed to address the weld microstructure and the mechanical performance. The asymmetrical nugget morphology and heterogeneous properties of the weld are due to the distinctive physical properties and strengthening mechanisms of the welded materials. The welding current range for the dissimilar pair falls between those for the similar combinations. A computational analysis using SORPAS is performed to address the resulted microstructure from welding.

中文翻译：

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可热处理和不可热处理异种铝合金的电阻点焊性

本研究解决了与 AA5xxx 和 AA6xxx 异种铝合金的电阻点焊相关的问题。焊接参数经过优化，以提供最大的搭接剪切强度和最大的熔核尺寸。由于焊缝的力学性能受热影响区和熔合区的特性影响，因此进行了显微分析以解决焊缝微观结构和力学性能问题。焊缝的不对称熔核形态和异质性能是由于焊接材料独特的物理性能和强化机制。不同对的焊接电流范围介于相似组合的焊接电流范围之间。使用 SORPAS 进行计算分析以解决焊接产生的微观结构。