AZ31B镁合金的光纤激光与CO<sub>2</sub>激光焊接特性

采用光纤激光和CO2激光对AZ31B-H24镁合金进行堆焊和对接焊试验研究。从接头的焊缝成形、微观组织和力学性能等角度，对比分析两种激光的镁合金焊接特性。结果表明，镁合金光纤激光对接焊能够获得较好的焊缝成形，具有较好的工艺适应性，接头强度达到母材的95%以上，断口显示为韧性断裂，韧窝大且深；镁合金CO2激光对接焊容易产生气孔缺陷，接头强度大幅降低，仅为母材的47.6%，断口为混合型断裂方式。

Abstract

The study on bead on plate (BOP) and butt laser welding characteristics of AZ31B-H24 magnesium alloys are carried out by using two lasers, fiber laser and CO2 laser. The effect of different lasers on characteristics is analyzed, from the point of the weld appearances, microstructures and mechanical properties. The results show that fiber laser welded joint has good weld appearance and better suitability. Tensile strength of it can reach 95% of that of base metal, fracture is typically ductile feature, in which dimple is big and deep, while CO2 laser welded joint tends to arise porosity, which sharply decreases its tensile strength, only 47.6% of that of base metal. Fracture mode is mixed mode including ductile and cleavage mode.

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檀财旺, 李俐群, 陈彦宾, 郭伟, 王威. AZ31B镁合金的光纤激光与CO₂激光焊接特性[J]. 中国激光, 2011, 38(6): 0603015. Tan Caiwang, Li Liqun, Chen Yanbin, Guo Wei, Wang Wei. Characteristics of Fiber Laser and CO₂ Laser Welding of AZ31B Magnesium Alloys[J]. Chinese Journal of Lasers, 2011, 38(6): 0603015.

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