低功率脉冲激光-电弧复合热源高效焊接过程中的“匙孔”行为研究

发布时间：2018-06-24 17:21

本文选题：激光“匙孔” + 等离子体　；参考：《机械工程学报》2016年02期

【摘要】：激光-电弧复合热源焊接技术由于具有焊接熔深大、效率高、质量好等优点而受到广泛关注。采用低功率脉冲激光-钨极惰性气体保护(Tungsten inert gas,TIG)焊电弧复合热源技术进行镁合金板材的焊接,研究激光脉冲作用消失之后的等离子体行为和激光"匙孔"行为。在上述试验结果的指导下优化工艺参数,对比研究采用单独激光焊、TIG电弧焊和复合热源焊这三种方法实现镁合金板材对接焊相同效果时焊接效率的差异。研究结果表明,激光"匙孔"和"匙孔"等离子体的形成是实现复合热源高效焊接的前提条件,恰当的工艺参数可以使得激光"匙孔"维持稳定的开口状态,这种状态提高了电弧的稳定性和能量密度,延长了镁等离子体的恢复时间,因此能够提高复合热源的焊接效率。达到相同焊接效果时复合热源的焊接效率分别达到单独激光焊接效率的7.14倍和单独TIG电弧焊接效率的4.29倍。
[Abstract]:Laser-arc hybrid heat source welding technology has attracted wide attention due to its advantages of high penetration, high efficiency and good quality. A low power pulsed laser-tungsten inert gas (Tungsten inert gas TIG) welding arc composite heat source technique was used to weld magnesium alloy sheet. The plasma behavior and laser "keyhole" behavior of magnesium alloy were studied after the laser pulse disappeared. Under the guidance of the above experimental results, the differences of welding efficiency between laser welding TIG arc welding and composite heat source welding for magnesium alloy sheet butt welding with the same effect were studied. The results show that the formation of laser "keyhole" and "keyhole" plasma is the prerequisite for the efficient welding of composite heat source, and the proper process parameters can make the laser "keyhole" maintain a stable opening state. This state improves the arc stability and energy density, prolongs the recovery time of magnesium plasma, and therefore improves the welding efficiency of composite heat source. The welding efficiency of composite heat source is 7.14 times that of single laser welding efficiency and 4.29 times that of TIG arc welding efficiency when the welding effect is the same.
【作者单位】：大连理工大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(11375038)
【分类号】：TG456

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