In order to obtain the temperature field distribution at the interface of Ti/Al dissimilar alloy joint and under-stand the interface reaction mechanism of Ti/Al dissimilar alloy joints,it was established that a moving Gauss surface heat source model for autogenous laser welding-brazing of TC4/6061 dissimilar alloys by using the finite element method,and it was explored that the temperature field distribution of autogenous laser welding-brazing of TC4/6061 dissimilar alloy joints under different laser powers.It was found that the temperature field distribution of the dissimilar titanium/aluminum alloy joint was not uniform.When the laser power was 1600 W and the welding speed was 15 mm/s,the peak temperatures of the upper,middle,and lower part of the joint interface were 1299,984,and 865℃ respectively.When the laser power was 1800 W and the welding speed was 15 mm/s,the peak temperatures of the upper,middle,and lower part of the joint interface were 1478,1119,and 982℃respectively.The model was proved to be accurate by the process test,which provided a reference for the numerical simulation and parameters formulation of laser self-fluxing brazing of related dissimilar alloys.
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