Effects of Prestress on Welding of 2A12 High Strength Al Alloy Thin Plate
The level and distribution of welding residual stresses has great impacts on the dimensional stability of aluminum alloy thin plates according to the theories and experimental data.A pre-applied tensile stress paralleling to the weld bead below material yield limit was introduced.The level and distribution of welding residual stresses and deflection deformation of 2A12 high-strength Al alloy thin plate were analyzed by X-ray stress measurer and three coordinates measuring machine(CMM).The results show that the residual stress amplitude can characterize the potential dimensional deformability of metal components.By introducing prestress,the welding residual stress can effectively decrease.The stress distribution can be obviously homogenized,and the dimensional stability of the weldment can be greatly enhanced.