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Proceedings Paper

Precision microwelding of thin metal foil with single-mode fibre laser
Author(s): Isamu Miyamoto; Seo-Jeong Park; Toshihiko Ooie
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Paper 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.

Paper Details

Date Published: 18 November 2003
PDF: 6 pages
Proc. SPIE 5063, Fourth International Symposium on Laser Precision Microfabrication, (18 November 2003); doi: 10.1117/12.541155
Show Author Affiliations
Isamu Miyamoto, Osaka Univ. (Japan)
Seo-Jeong Park, Osaka Univ. (Japan)
Toshihiko Ooie, National Institute of Advanced Industrial Science and Technology (AIST) (Japan)

Published in SPIE Proceedings Vol. 5063:
Fourth International Symposium on Laser Precision Microfabrication
Isamu Miyamoto; Andreas Ostendorf; Koji Sugioka; Henry Helvajian, Editor(s)

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