采用激光诱导TIG电弧焊方法进行了1.5 mm厚6061-T6和5083-O异种铝合金的拼焊试验,系统研究了激光的加入对焊接接头塌陷变化和力学性能的影响规律。结果表明:由于两种铝合金的化学成分和热物理性能的差异,焊接接头会出现不一致的塌陷现象;与电弧焊相比,激光的加入不仅可以有效降低焊接接头的塌陷程度,还会大幅降低焊接接头塌陷深度比的不一致程度;随着激光功率增大,焊接接头塌陷的不一致程度呈减小的趋势,导致接头受力情况发生变化,使接头强度呈先增后减的趋势。

Laser-induced TIG arc welding is used to weld 1.5-mm dissimilar aluminum alloys 6061-T6 and 5083-O to systematically study the influence of the addition of a laser on the collapse and mechanical properties of welded joints. We find that the welded joints appear inconsistent owing to the difference in chemical compositions and thermophysical properties of the two aluminum alloys used. Compared with traditional arc welding, the addition of a laser can not only effectively reduce the degree of collapse of the welded joint, but also greatly reduce the inconsistent collapse depth ratio of the welded joint. Moreover, the inconsistent collapse of the welded joints shows a decreasing trend with the increasing laser power used for welding. It causes the joint stress to change; therefore, the joint strength first increases and subsequently decreases.