高速列车6005A-T6铝合金型材激光-双丝MIG复合焊

分别利用双丝MIG焊和激光-双丝MIG复合焊进行了高速列车6005A-T6铝合金型材的焊接试验研究,对比分析了两种焊接方法的焊缝成形、焊接变形、接头力学性能及其接头微观组织.结果表明,激光-双丝MIG复合焊接6005A-T6铝合金型材时的焊接速度可达4.5 m/min,焊接过程具有较好的搭桥能力,对接间隙达到1.4 mm时,仍可以获得良好的焊缝成形.当焊接速度大于或等于4 m/min时,复合焊接头的焊接变形量仅为常规双丝MIG焊的40%左右,其抗拉强度达到了母材强度的83%,比常规双丝MIG焊接头的抗拉强度提高了9%左右.

Laser-tandem MIG hybrid welding for 6005A-T6 aluminum alloy profile of high-speed train

Welding research of 6005A-T6 aluminum alloy profile for high-speed train was done by using tandem MIG welding and laser-tandem MIG hybrid welding individually.The weld appearance,welding distortion,mechanical properties of the joints and microstructure were analyzed.The results demonstrated that high-efficient welding for the profile was achieved by using laser-tandem MIG hybrid welding,the speed of which was up to 4.5 m/min.The process had a good gap bridging ability that even if the gap of the butt joint was up to 1.4 mm,a good weld appearance could also be got.While the hybrid welding speed was greater than 4 m/min,the welding distortion of the laser-tandem MIG hybrid joints was just about 40% of that of the tandem MIG joints.And tensile strength of the hybrid joints was 83% of that of 6005A-T6 base metal,9% higher than that of the tandem MIG joints.