研究了8090 Al-Li合金的YAG激光焊,通过金相观察、显微硬度测定以及电子探针微区成分分析,结果表明：在一定的焊接工艺参数下,能得到优良的焊接接头。单面焊能焊厚度≤0.7 mm,双面焊能焊厚度≤1.4 mm,焊缝为细晶组织,焊缝窄,热影响区小,焊后应即时去应力处理。

Welded joints of Al-Li alloy welded by YAG laser are investigated through metalloscopy, micro-hardness and electron probe micro-analysis. The results showed that a suitable welded joint can be obtained under proper welding parameters. The thoroughly penetrated thickness does not exceed 0.7 mm for the single impulse welding and 1.4 mm for the double impulse welding. The weld is narrow and has a fine grain structure while the wideness of the heat affected zone is small. Moreover, a stress releasing treatment must be done as soon as possible after welding.