工业纯钛光纤激光-MIG复合焊接工艺及性能
Fiber laser-MIG hybrid welding process of commercial pure titanium and its properties
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摘要: 采用光纤激光与熔化极惰性气体保护电弧焊(MIG焊)复合焊接工业纯钛,分别对激光焊、MIG焊和复合焊接头的焊缝表面成形、横断面进行了观察,并进行了激光焊和复合焊接头的拉伸试验及杯突试验.结果表明,复合焊的电弧稳定性比MIG焊显著提高,焊接速度可提高7倍;复合焊与激光焊接头的抗拉强度高于母材;复合焊接头的杯突值优于激光焊接头的杯突值,这是因为复合焊焊缝的微观组织有利于接头的塑性.因此,采用光纤激光-MIG电弧复合焊接方法很好地实现了工业纯钛的高速焊接,焊缝成形良好,接头的塑性优于单一激光焊的塑性.Abstract: Fiber laser-metal inert gas(MIG) arc hybrid welding was used to weld the commercial pure titanium(CP-Ti).The weld appearance, cross section, tensile strength, Erichsen value and microstructure of the CP-Ti welded joints were studied.The results show that the arc stability is substantially improved and the welding speed can be increased to 7 times by fiber laser-MIG hybrid welding.The welded joints by laser welding and the hybrid welding exhibit the higher ultimate tensile strength than those of the base metal.In addition, the welded joint by the fiber laser-MIG hybrid welding has higher Erichsen values than that by laser joints.The difference in plasticity is attributed to the microstructure changes in the welded joint of hybrid welding.Thus, the fiber laser-MIG hybrid welding of CP-Ti can be carried out successfully at higher welding speed with a good combination of weld bead appearance and plasticity.
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