The main focus of this study is to use the flip chip model and the finite element analysis software ANSYS to predict the temperature field and stress field distribution generated in laser micro-welding. The moving Gaussian heat source is used as the heat source model of loading. The results of transient thermal analysis show that the minimum temperature is greater than the eutectic temperature of 63Sn-37Pb solder, and the temperature decreases from the laser motion path to the surrounding. The results of thermo-mechanical coupling analysis show that when the laser moving speed decreases, the equivalent stress and deformation increase, and higher temperature is generated at the same time.
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