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Proceedings Paper

Thick-plate welding with Nd:YAG laser and COIL
Author(s): Tokuhiro Nakabayashi; Fumio Wani; Akiyoshi Hayakawa; Sachio Suzuki; Kozo Yasuda
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Paper Abstract

In the field of heavy industries, many products are made of thick metal parts. Nd:YAG laser has been recently developed up to 10 kW. Nd:YAG laser has the characteristics of the optical fiber transmittance and the good absorption by the metal surface, so that it is expected to apply Nd:YAG laser to thick plate welding. This study presents the thick plate welding with Nd:YAG laser and COIL (Chemical Oxygen-Iodine Laser). We have developed a coaxial beam combining system with beams of Nd:YAG laser and COIL. The maximum average power of the combined beam was 19 kW. Welding tests of 304 stainless steel plates were carried out. The effects of various welding parameters were investigated, such as the laser power and pulse modulation. As a result, it was clarified that the pulse wave has good efficiency of deeper penetration as compared to continuous wave at low welding speed. When the combined beam was used, 20 mm penetration depth on the stainless steel could be obtained in high aspect ratio at welding speed of 1m/min. When the combined beams and another Nd:YAG laser beam whose power was 4 kW were used, both side welding on 30 mm thickness plate could be achieved.

Paper Details

Date Published: 3 March 2003
PDF: 6 pages
Proc. SPIE 4831, First International Symposium on High-Power Laser Macroprocessing, (3 March 2003); doi: 10.1117/12.497725
Show Author Affiliations
Tokuhiro Nakabayashi, Kawasaki Heavy Industries, Ltd. (Japan)
Fumio Wani, Kawasaki Heavy Industries, Ltd. (Japan)
Akiyoshi Hayakawa, Kawasaki Heavy Industries, Ltd. (Japan)
Sachio Suzuki, Kawasaki Heavy Industries, Ltd. (Japan)
Kozo Yasuda, Kawasaki Heavy Industries, Ltd. (Japan)

Published in SPIE Proceedings Vol. 4831:
First International Symposium on High-Power Laser Macroprocessing
Isamu Miyamoto; Kojiro F. Kobayashi; Koji Sugioka; Reinhart Poprawe; Henry Helvajian, Editor(s)

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