DC-LSND welding technique of 1420 Al-Li alloy

The applications of DC-LSND (dynamically controlled low stress non-deformation)welding technique on 1420 Al-Li alloy butt welded plate and penetrated T-weld were investigated respectively.By comparison of residual stress and distortion, weld microstructure and tensile properties between conventional TIG welding and DC-LSND welding, the reason why DC-LSND technique can control welding stress and distortion was discussed.The results showed that DC-LSND technique could effectively decrease residual stress and distortion of the 1420 Al-Li alloy butt welded plate, while hadn' t apparent effect on the joint tensile properties.The welding stress and distortion of 1420 Al-Li alloy penetrated T-weld could also be controlled.