激光-电弧复合焊接过程中熔池中的锁孔行为及液体流动

Y. Naito, S. Katayama, A. Matsunawa
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引用次数: 29

摘要

采用YAG激光结合TIG电弧在不同条件下对304型不锈钢板进行了复合焊接。通过CCD相机和x射线实时透射仪,测量电弧和激光-电弧复合焊接过程中电弧电压的变化,观察电弧等离子体、激光诱导羽流和蒸发斑、锁孔行为和熔池中液体的流动。结果表明,与YAG激光焊接相比,混合焊接具有许多特点。高功率密度的YAG激光束用TIG电弧稳定地照射在预先形成的熔池上,可以产生最深的焊缝。锁孔长而窄,其在熔池内的行为相当稳定。研究还证实,利用中等功率密度的激光抑制混合焊接中的气泡形成,可以降低气孔率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Keyhole behavior and liquid flow in molten pool during laser-arc hybrid welding
Hybrid welding was carried out on Type 304 stainless steel plate under various conditions using YAG laser combined with TIG arc. During arc and laser-arc hybrid welding, arc voltage variation was measured, and arc plasma, laser-induced plume and evaporation spots as well as keyhole behavior and liquid flow in the molten pool were observed through CCD camera and X-ray real-time transmission apparatus. It was consequently found that hybrid welding possessed many features in comparison with YAG laser welding. The deepest weld bead could be produced when the YAG laser beam of high power density was shot on the molten pool made beforehand stably with TIG arc. A keyhole was long and narrow, and its behavior was rather stable inside the molten pool. It was also confirmed that porosity was reduced by the suppression of bubble formation in hybrid welding utilizing a laser of a moderate power density.
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