The IN738 superalloy laser welding and TIG welding were analyzed by 3D finite element analysis method

and the effects of different welding procedure on the residual stress and plastic strain were analyzed.To verify the accuracy of the simulated results

the temperature field and residual stress field were measured during welding test.The results indicate that the maximum residual stress of laser welding is higher than that of TIG welding.In the weld centerline and heat affected zone

the longitudinal residual stress of laser welding is the higher than that of TIG welding

and the tensile stress region of laser welding is the narrower than that of TIG welding.Compared to TIG welding

the plastic deformation zone width of laser welding is the smaller

and the plastic strain value is relatively lower.The calculated temperature field and residual stress field of laser welding and TIG welding are basically consistent with the measured ones

and only at the weld

there is some difference in lateral residual stress.