1420铝锂合金动态低应力无变形焊接技术

DC-LSND welding technique of 1420 Al-Li alloy

摘要: 针对1420铝锂合金平板对接和T形穿透焊接结构,开展了动态低应力无变形(DC-LSND,dynamically controlled low stress non-deformation)焊接技术的可行性研究;通过与常规TIG焊进行焊接应力和变形、接头组织以及拉伸性能的对比,分析了该技术实现应力和变形控制的原因。结果表明,采用动态低应力无变形焊接1420铝锂合金平板对接结构,能够有效地减小焊接应力和变形,并且对接头的拉伸性能没有影响,同时采用该技术可实现铝锂合金T形接头穿透焊的应力和变形的控制。

Abstract: 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.