工艺参数对2A97T3铝锂合金光纤激光焊接焊缝成形的影响

通过系统的工艺试验研究了1.2mm的2A97T3铝锂合金光纤激光焊接工艺参数对焊缝成形的影响。结果表明:增大焊接热输入会使焊缝熔宽及背宽比增加,其中背面熔宽变化显著,而正面熔宽变化幅度较小;焊接热输入过大时,会出现因焊缝下塌而导致熔宽减小的现象。随着焊接速度和激光功率的增大,形成深熔焊缝的参数范围会越来越窄。在线能量相同的情况下,高速焊所获得的焊缝成形较好,热导焊焊缝硬度明显高于深熔焊焊缝的硬度。

Effect of Welding Process on Fiber Laser Welding of 2A97T3 AI-Li Alloy

Effects of the welding process on fiber laser welding of 1.2mm 2A97T3 Al-Li alloy are studied through a lot experiments.The results show that with the increase of the welding heat input,the welding bead width and the backtop width ratio will be improved.Moreover,the variation of the back side bead width is significant,while the top side bead width has small changes.Too much heat input will lead to decrease of welding bead width due to the collapse of welding seam.The welding process parameters will be much more narrow when laser power and welding speed increasing.Under the condition of the same welding linear energy,welding forming of high speed is better.The hardness of laser thermal conducting welding is obviously higher than that of laser deep penetration welding.