Experimental and Numerical Simulation on Laser welding of High Manganese TWIP980 Steel

摘要： In this paper, the numerical simulation of laser tailoring process for the 2mm thickness TWIP980 steel sheet is carried out using Simufact welding software. The results show that the center of the laser welding heat source is small, and temperature is high. The front of the weld pool has a drop-shaped profile and a funnel-shaped cross section. The simulated weld joint has a high degree of conformity comparing to the actual weld joint. As the heat input (line energy) increases, the peak temperature of the thermal cycle and the weldment width increase. The simulated results indicate that the residual stress of the weld joint perpendicular to the weld along the surface is greater than that along the weld direction, and are both greater than the residual stress perpendicular to the weld along the thickness direction. The residual stress generated by welding is mainly concentrated in the direction perpendicular to the weld seam. With the heat input increase, the deformation after welding increases. For the studied TWIP980 steel, the recommending laser tailored blank (LTB) weld parameters are: power 3kW and welding speed 3m/min, which is the optimum welding process in the practical welding. The guiding significance of the software for laser welding simulation of TWIP980 steel was verified.