6005A-T6铝合金搭接接头激光焊工艺研究

Research on Laser Welding Technology of 6005A-T6 Aluminum Alloy Lap Joint

文章以6005A-T6铝合金为研究对象,进行搭接接头激光焊工艺研究。研究内容包括送丝速度不变,提高激光功率;激光功率不变,提升送丝速度。结果显示,2 mm厚6005A-T6铝合金搭接接头激光焊后接头表面成型良好,但当激光功率达到5000 W时背部出现焊洇;当送丝速度不变提高激光功率时,焊缝金属更易铺展,熔合性能增加,焊缝表面纹路变得深而清晰;同时随着激光功率的增加,力学性能与力学性能增加幅度都在增加。当激光功率不变,增加送丝速度时,其表面成型质量下降,接头熔深、力学性能呈现先提高再下降。观察力学断裂试样,断裂位置在上板熔合线时的力学性能要高于断裂在下板熔合线位置时的力学性能。显微组织检测结果显示,搭接接头激光焊焊缝,熔合线附近出现明显的柱状晶组织,焊缝中心为等轴晶粒。

Taking 6005A-T6 aluminum alloy as the research object,the laser welding technology of lap joint is studied in this paper.The research contents include increasing the laser power with constant wire feed speed,laser power unchanged and improve wire feed speed.The results show that the surface of the 2 mm 6005A-T6 aluminum alloy lap joint is well formed after laser welding,but the welding blots appear on the back when the laser power reaches 5000w.When the wire feeding speed is unchanged and the laser power is increased,the weld metal is easier to spread,the fusion performance is increased,and the weld surface texture becomes deep and clear.At the same time,with the increase of laser power,mechanical properties and mechanical properties increase.When the laser power is unchanged and the wire feeding speed is increased,the surface forming quality decreases,the joint penetration depth and mechanical properties increase first and then decrease.The mechanical properties of the fracture specimens at the fusion line of the upper plate are higher than those at the fusion line of the lower plate.The results of microstructure testing show that the laser welding seam of the lap joint has obvious columnar crystal structure near the fusion line,and the center of the weld is equiaxed grain.