Observation of molten metal behavior during laser irradiation: basic experiment to understand laser welding phenomena

Masami Mizutani; Seiji Katayama; Akira Matsunawa

doi:10.1117/12.497909

3 March 2003 Observation of molten metal behavior during laser irradiation: basic experiment to understand laser welding phenomena

Masami Mizutani, Seiji Katayama, Akira Matsunawa

Author Affiliations +

Proceedings Volume 4831, First International Symposium on High-Power Laser Macroprocessing; (2003) https://doi.org/10.1117/12.497909
Event: LAMP 2002: International Congress on Laser Advanced Materials Processing, 2002, Osaka, Japan

Abstract

In order to understand laser keyhole welding phenomena, pulsed or continuous wave laser was irradiated on a molten metal of Sn or Zn, and spattering and keyhole evolution were observed by high-seed video camera and X-ray transmission method, respectively. It was confirmed from the observation of the surface that a keyhole was initiated to form by far earlier in the molten metal than in the solid metal. According to the X-ray transmission real-time observation result in Zn liquid metal, bubbles were predominantly generated from the tip of a keyhole, which is the same formation mechanism as we revealed in general laser welding. Furthermore, simplified numerical calculation demonstrated that surface tension should affect the formation of such bubbles.

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Masami Mizutani, Seiji Katayama, and Akira Matsunawa "Observation of molten metal behavior during laser irradiation: basic experiment to understand laser welding phenomena", Proc. SPIE 4831, First International Symposium on High-Power Laser Macroprocessing, (3 March 2003); https://doi.org/10.1117/12.497909

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