采用脉冲激光对纯铝和不锈钢进行搭接焊。研究结果表明，接头力学性能与焊缝深度有着密切的联系。为此，对两个不同焊缝深度的接头进行了研究。当焊缝深度为354μm 时，铝和熔化区的界面产生了富铝的铁铝金属间化合物和微裂纹，接头强度为(27.2±1.7) N/mm，在铝和熔化区界面处发现了3种不同的断裂模式。当焊缝深度为108μm 时，铝和熔化区的界面仅产生了富铁的铁铝金属间化合物，未观察到任何缺陷。当接头强度为(46.2±1.9) N/mm 时，在铝和熔化区界面处仅发现了一种断裂模式。
Pulsed laser welding was used in joining pure aluminum to stainless steel in a lap joint configuration. It is found that the mechanical properties of the laser joints were closely correlated with the bead geometry, i.e., penetration depth. In order to study the correlation, two typical laser welds with different penetration depths were analyzed. In high penetration depth (354 μm) joint, Al-rich Fe?Al IMCs with microcracks were formed at the Al/fusion zone (FZ) interface. The joint strength was found to be (27.2±1.7) N/mm and three failure modes were observed near the Al/FZ interface. In low penetration depth (108 μm) joint, Fe-rich Fe?Al IMCs without any defect were formed at the Al/FZ interface. The joint strength was found to be (46.2±1.9) N/mm and one failure mode was observed across the FZ.
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