Research on the Argon Arc Welding and the Laser Welding of Al-Li Alloy

Refers to the weldability of domestic Al-Li alloy in the Al-Li-Mg-Cu-Zr system.Our study shows that under the protection of purified argon gas and cover, Al-Li alloy can be well-welded by argon arc welding. There is a little oxidated colour in the weld joint and heataffected zones'surfaces. Optical microscope analysis shows that the weld joint is combined well and has certain mechanical properties. Li couldn't be analyzed, but electron probe microanalysis shows that there is a little change in other compositions in the welded joint and the heat-affected zone, and 3. 50 mm thick samples were welded completely. Al-Li alloy can also be welded by YAG Laser welding under the protection of Ar gas. Single impluse welding can get through≤0. 7 mm thick Al-Li alloy plate, while double impulse welding can be through1.50 mm thick one. The welded joints and the heat-affected zone keep the metallic luster.The welding seam is narrow and microanalysis shows that the welding seam, and the heat-affected zone's composition little change.