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Ti-6Al-4V钛合金蒙皮和骨架叠焊在航空航天器制造领域有着广泛应用。采用4 k W ROFIN光纤激光器对其进行激光叠焊,利用数码显微镜、光学显微镜、扫描电镜和万能试验机研究激光焊接工艺参数对叠焊焊缝几何尺寸、气孔数量、显微组织和力学性能的影响。结果表明,三管侧吹保护气嘴优于单管侧吹保护气嘴,气流量≥5 L/min时可获得无氧化的焊缝;间隙控制在0.1 mm范围内能有效抑制气孔生成,重熔能有效地减少焊缝中已有的气孔;当激光焊接功率、焊接速度和离焦量分别为1700 W、1.5 m/min和+8 mm时可制得气孔最少、剪切强度最高的叠焊接头。
Ti-6Al-4V titanium alloy skin and seam welding has a wide range of applications in the manufacture of aerospace vehicles. Laser welding was carried out on 4 k W ROFIN fiber laser. The effects of laser welding parameters on the geometrical dimensions, number of stomata, microstructure and mechanical properties were studied by digital microscope, optical microscope, scanning electron microscope and universal testing machine influences. The results show that the three-tube side blow protection gas nozzle is superior to the single tube side blow protection gas nozzle, and the oxidation-free weld seam can be obtained when the gas flow rate is ≥5 L / min. The gap control within 0.1 mm can effectively inhibit the generation of stomatal Melting can effectively reduce the existing pores in the weld seam. When the laser welding power, welding speed and defocus amount are 1700 W, 1.5 m / min and +8 mm respectively, the stomata with the least porosity and the highest shear strength can be obtained Welding head.