Keyhole behavior and liquid flow in molten pool during laser-arc hybrid welding

Yasuaki Naito; Seiji Katayama; Akira Matsunawa

doi:10.1117/12.497763

3 March 2003 Keyhole behavior and liquid flow in molten pool during laser-arc hybrid welding

Yasuaki Naito, Seiji Katayama, Akira Matsunawa

Proceedings Volume 4831, First International Symposium on High-Power Laser Macroprocessing; (2003) https://doi.org/10.1117/12.497763
Event: LAMP 2002: International Congress on Laser Advanced Materials Processing, 2002, Osaka, Japan

Abstract

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.

Citation Download Citation

Yasuaki Naito, Seiji Katayama, and Akira Matsunawa "Keyhole behavior and liquid flow in molten pool during laser-arc hybrid welding", Proc. SPIE 4831, First International Symposium on High-Power Laser Macroprocessing, (3 March 2003); https://doi.org/10.1117/12.497763

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