Precision microwelding of thin metal foil with single-mode fibre laser

Isamu Miyamoto; Seo-Jeong Park; Toshihiko Ooie

doi:10.1117/12.541155

18 November 2003 Precision microwelding of thin metal foil with single-mode fibre laser

Isamu Miyamoto, Seo-Jeong Park, Toshihiko Ooie

Proceedings Volume 5063, Fourth International Symposium on Laser Precision Microfabrication; (2003) https://doi.org/10.1117/12.541155
Event: Fourth International Symposium on Laser Precision Microfabrication, 2003, Munich, Germany

Abstract

Microwelding thin stainless steel foil with thickness between 10 and 100 μm was studied by using a single-mode Yb-fiber laser with a CW maximum output of 40W, of which focused spot size was approximately 10 μm in diameter providing maximum power density of 10⁸W/cm². The energy coupled to the specimen was estimated by the thermal conduction analysis and the laser energy passing through the metal foil measured by an integrating sphere. The critical power density for keyhole welding was approximately 2.5 * 10⁷W/cm², which was at least 2 orders larger higher than the conventional macrowelding. Keyhole welding was maintained up to at least 1 m/s without weld defects such as humping and undercut, because the flow velocity of molten metal around the keyhole is lowed so that instability of the melt flow behind the keyhole can be suppressed in microwelding at high welding speeds. Sound lap welding of thin foils of the thickness of 10 μm to 30 μm was demonstrated even with gaps between the foils.

Citation Download Citation

Isamu Miyamoto, Seo-Jeong Park, and Toshihiko Ooie "Precision microwelding of thin metal foil with single-mode fibre laser", Proc. SPIE 5063, Fourth International Symposium on Laser Precision Microfabrication, (18 November 2003); https://doi.org/10.1117/12.541155

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