低功率YAG激光-TIG电弧复合焊接镁合金薄板工艺

以2 mm厚AZ31B变形镁合金薄板为研究对象开展低功率脉冲YAG激光-TIG电弧复合热源焊工艺研究,分析了激光与电弧的能量匹配对焊缝成形的影响规律.结果表明,镁合金薄板低功率YAG激光-TIG电弧复合热源焊接过程中,激光能量与电弧能量之间的相互匹配将直接影响焊缝的表面成形,获得理想焊接接头的工艺参数区间相对较狭小.为使焊缝成形均匀连续,焊接过程中需要对焊缝背面采用氩气进行保护,当保护气体流量为5～10 L/min时获得了具有最佳性能的焊接接头,其拉伸载荷达到镁合金母材的95%以上.

Low power laser-TIG arc hybrid welding of thin magnesium alloy plate

Low-power pulsed Nd:YAG laser-TIG hybrid welding process of 2 mm AZ31B magnesium alloy plate was studied.The experiments results showed that the energy cooperation between laser and arc will have influence on the weld appearance HJ1.35mm]in laser-TIG arc hybrid welding process.The favorable range of hybrid welding parameters was relatively narrow at high welding speed.In order to get the ideal joint, the back of the specimen should be protected by the Ar gas.When the protective gas flow was 5-10 L/min, the favorable performance can be obtained.The tensile strength of laser-arc hybrid welding joint was 95% of Mg base metal.