光束扫描对5A06铝合金激光焊缝组织的影响

Effect of Beam Scanning on Microstructure of Laser Weld of 5A06 Aluminum Alloy

针对武器装备领域中常用的5A06铝合金材料,利用IPG6000光纤激光器开展了光束扫描对5A06铝合金激光焊缝成形和组织的影响研究,讨论了4种不同光束扫描焊接模式下5A06铝合金激光焊缝的微观组织及力学性能。结果表明,随着光束扫描的加入,铝合金激光焊缝熔深略有下降,其中,"8"光束扫描模式熔深最小,"∞"光束扫描模式下得到的焊缝成形美观,熔深适当,焊缝横截面呈"倒梯形";"8"和"∞"光束扫描模式下晶粒细化效果最好,"丨"光束扫描模式细化效果最差;"∞"光束扫描模式下得到的5A06铝合金焊接接头抗拉强度可达到母材的95.4%,接头断后延伸率可达11.8%,焊缝断口为韧性断裂。

Aiming at the commonly used 5A06 aluminum alloy in the field of weaponry and equipment, the influence of beam scanning on the forming and microstructure of 5A06 aluminum alloy laser welded seam is studied by fiber laser. The microstructure and mechanical properties of 5A06 aluminum alloy laser welds under different laser scanning and welding modes are discussed. The experimental results show that with laser beam scanning, the penetration depth of aluminum alloy decreases slightly. The minimum penetration depth in ＂8＂ scanning mode. In ＂∞＂ scanning mode, the forming is beautiful, the penetration depth is appropriate and the weld cross section is inverted trapezoidal shape. In ＂8＂ and ＂∞＂ scanning mode, the grain refinement is the best. However, in ＂ ｜ ＂ scanning mode, the grain refinement is the worst. The tensile strength of 5A06 aluminum alloy welded joint obtained in＂∞＂scanning mode could be up to 95.4% of base metal and joint extension rate could be up to 11 %, and the weld fracture is ductile fracture.