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Abstract
A technique for the autogenous laser welding of stainless steel to copper alloy in a butt joint has been developed, by which microfissuring in the heat affected zone of stainless steel can be eliminated. The impinge direction and the offset of the laser beam played the dominant roles in achieving this. The sound weld of AISI 316L–C18100 contained 3·0 wt-% copper in the fusion zone with dendrite structures. However, banding and spherical structures were present in the fusion zone with a high percentage of copper and microfissuring was strongly related to the distribution of copper in this region. A model is proposed for achieving a sound butt joint and the mechanism of microfissuring is also discussed.