【摘要】 针对8 mm厚6082铝合金，采用振荡激光-电弧复合焊接技术，深入研究不同焊接方式对焊缝成形、气孔率、微观组织及力学性能的影响。结果显示，与单面焊接相比，双面焊接形式不利于气孔的逸出，但是双面焊可以通过细化焊缝晶粒提升焊缝力学性能。在焊缝中心区域，金相组织以等轴晶为主，沿板厚方向向下，等轴晶晶粒尺寸逐渐减小。相较于焊缝上部区域的电弧作用区，在焊缝底部的激光作用区等轴晶晶粒尺寸减小了58%。与单面焊相比，焊缝等轴晶晶粒尺寸降低了31%,接头抗拉强度提升了7.1%,延伸率提升了49.3%。更多还原

【Abstract】 For the 8 mm thick 6082 aluminum alloy, the effects of different welding methods on weld forming, porosity, microstructure and mechanical properties were studied in depth by using oscillating laser-arc composite welding technology. The results show that compared with single-sided welding, double-sided welding is not conducive to the escape of pores, but double-sided welding can improve the mechanical properties of welding seam by refining welding seam grains. In the central area of the welding seam, the metallographic structure is dominated by equiaxed grains, and the isometric grain size gradually decreases along the direction of plate thickness. Compared to the arc action zone in the upper part of the welding seam, the isometric grain size in the laser action zone at the bottom of the welding seam is reduced by 58%. Compared with single-sided welding, the equiaxed grain size of the welding seam is reduced by 31%, the tensile strength of the joint is increased by 7.1%, and the elongation is increased by 49.3%.更多还原