Dissimilar metals welding between SUS304 and A5052 has been carried out by using a pulse YAG laser. Weldable conditions were obtained at spot diameter of 0.8 mm. Shear-tensile test and peel test was conducted to evaluate strength of the joint. The maximum strength for both shear-tensile and peel was obtained for the joint welded with laser irradiation condition of 280V-4msec. Reason for degradation of strength of the joint welded with higher heat input could be occurrence of under cutting and large formation of intermetallic phase. Change of the strength due to change in heat input was significantly observed for peel mode compared to that for shear-tensile mode. According to FEM analysis, molten pool depth affects on strength of the joint. It was observed that the strength of the joint under peel mode is more sensitive to the change in molten pool depth.
