铝合金双光束/单光束激光-TIG复合焊

针对4mm厚5A06铝合金,分析了双光束光纤激光-TIG复合焊的焊缝成形特点、气孔率、匙孔动态特征及接头力学性能,并与单光束光纤激光-TIG复合焊对比。结果表明,在获得相同焊缝背面熔宽条件下,与单光束激光-TIG复合焊相比,双光束激光-TIG复合焊的焊缝背面成型连续性、均匀性更优且熔宽波动较小,焊缝气孔率降低50%以上,激光匙孔开口面积平均值更大,波动变异系数更小;双光束激光-TIG复合焊接头抗拉强度、断后伸长率、显微硬度、组织与单光束激光-TIG复合焊结果差别不大。

Characteristic comparison of dual and single fiber laser beam-TIG arc hybrid welding of aluminum alloy

The characteristics of weld seam appearance, porosity, key hole behavior and mechanical properties of welded joint were analyzed with 4 mm thick aluminum alloy welded by dual and single fiber laser beam-TIG arc hybrid welding process, respectively. The results show that, when the backside melting width is similar in laser-TIG arc hybrid welding process by using dual laser beam and single laser beam, and comparing with single beam laser-TIG arc hybrid welding method, the continuity and uniformity of backside weld seam appearance are better when the dual beam laser-TIG arc hybrid welding method was used. The porosity is reduced by more than 50%. The average surface area of key hole is larger; the coefficient of surface variation of key hole is smaller. But the tensile strength, percentage elongation of fracture, microhardness and microstructure of hybrid welded joint are similar by using dual laser beam and single laser beam.