Deep penetration welding process with ultra-fine keyhole of thin stainless steel foil with thickness between 10μm and 100μm was studied using a single mode Yb-fiber laser with a CW maximum output of 40W. The spot size of approximately 10 m at 1/e2-power point of the maximum value was obtained, which provides power density of 108W/cm2 at 40W. Ultra-fine keyhole process was discussed based on energy coupled to the specimen WC, the laser energy passing though the metal foil WP and the back-reflected laser power WR and keyhole process was compared with that of electron beam welding. It was found that defocusing by the refraction in the plume cannot be neglected without assist gas in laser welding with such a fine spot diameter at especially low welding speeds. Although the critical power density for keyhole welding was 1 to 2 orders larger higher than the case of macrowelding, keyhole was maintained up to at least 1m/s at 25W, providing penetration depth of 50μm, if the keyhole condition is once fulfilled in microwelding. Humping is suppressed in microwelding because the flow path beside the keyhole is kept larger even at very high welding speeds resulting in reduced flow velocity of the molten metal.
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ICALEO 2003: 22nd International Congress on Laser Materials Processing and Laser Microfabrication
October 13–16, 2003
Jacksonville, Florida, USA
ISBN:
978-0-912035-75-8
PROCEEDINGS PAPER
Ultrafine-keyhole welding process using single-mode fiber laser
Isamu Miyamoto;
Isamu Miyamoto
*
Department of Manufacturing Science Graduate School of Engineering, Osaka University
2-1 Yamada-Oka, Suita, Osaka 565-0871, Japan
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Seo-jeong Park;
Seo-jeong Park
*
Department of Manufacturing Science Graduate School of Engineering, Osaka University
2-1 Yamada-Oka, Suita, Osaka 565-0871, Japan
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Toshihiko Ooie
Toshihiko Ooie
**
Single-Molecule Bioanalysis Laboratory National Institute of Advanced Industrial Science and Technology (AIST)
2217-14 Hayashi-Cho, Takamatsu, Kagawa 761-0395, Japan
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Published Online:
October 01 2003
Citation
Isamu Miyamoto, Seo-jeong Park, Toshihiko Ooie; October 13–16, 2003. "Ultrafine-keyhole welding process using single-mode fiber laser." Proceedings of the ICALEO 2003: 22nd International Congress on Laser Materials Processing and Laser Microfabrication. ICALEO 2003: 22nd International Congress on Laser Materials Processing and Laser Microfabrication. Jacksonville, Florida, USA. (pp. M201). ASME. https://doi.org/10.2351/1.5060102
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