Analysis of test about residual stress of super steel spot welding under different process

In order to analyze the effect on resistance spot welding residual stress of super steel under different process, the B1500HS steel sheet which is after the quenching process of the fast cooling is choosed as the material in this experiment. The resistance spot welding component is conducted by German spot welding robot NIMAK. The X-ray diffraction method is used to measure the components residual stress of weld nugget, heat affected zone and parent metal area. The results showing that the residual stress is distributing symmetrically around the welding core and the value of residual stress increases first then decreases from welding core to the parent metal. Besides, the residual stress reaches its maximum value in the heat affected zone and characterized by tensile stress, then it reduced to be pressure stress away from the welding core, meanwhile the maximum tensile stress significantly powerful than the maximum pressure stress. The electrode diameter can increase the residual stress with the increase of welding current the residual stress increasise first than decrease. The forging pressure can effectively reduces the value of residual stress.