Laser welding of Copper is a challenge due to its high thermal conductivity, low absorptivity of laser light and facility to dissolve oxygen favoring the formation of oxides. However, recent developments suggest that these problems can be overcome by power spatial modulation of the laser beam. This paper presents results on laser welding with beam oscillation (wobbling effect) performed on Copper plates. The effect of the major welding parameters on the weld surface aspect and bead profile are discussed, as well as the microstructure evolution. An interesting feature was observed in the microstructure of the fusion zone in the form of circular shaped bands which result from the solidification front of the weld metal as the laser oscillates and travels continuously. No defects were seen in the welds suggesting this variant of laser welding has potential for industrial applications where high thermal and/or electrical conductivities are required.

铜的激光焊接是一项挑战，因为它的高导热性，低激光吸收率以及易于溶解的氧气易于形成氧化物。然而，最近的发展表明，可以通过激光束的功率空间调制来克服这些问题。本文介绍了在铜板上进行光束振荡（摆动效应）的激光焊接结果。讨论了主要焊接参数对焊接表面外观和焊道轮廓的影响，以及微观组织的演变。在熔化区的微观结构中观察到一个有趣的特征，形状为圆形带，这是由于激光振荡和连续传播时焊接金属的凝固前沿所致。