High-power COIL and YAG laser welding

Fumio Wani; Tokuhiro Nakabayashi; Akiyoshi Hayakawa; Sachio Suzuki; Kozu Yasuda

doi:10.1117/12.465774

6 May 2002 High-power COIL and YAG laser welding

Fumio Wani, Tokuhiro Nakabayashi, Akiyoshi Hayakawa, Sachio Suzuki, Kozu Yasuda

Proceedings Volume 4631, Gas and Chemical Lasers and Intense Beam Applications III; (2002) https://doi.org/10.1117/12.465774
Event: High-Power Lasers and Applications, 2002, San Jose, California, United States

Abstract

We have constructed a laser welding system, which enabled high-power laser welding by combining three laser beams of 1 mm wavelength. Its wavelength enables optical silica fibers transmission and the flexible system. The heart of this system consists of a 4 kW and a 6 kW Nd:YAG lasers and a 10 kW Chemical Oxygen-Iodine Laser (COIL). The average power of the combined beam is up to over 20 kW. The effects of various welding parameters were investigated, such as the laser power, pulse modulation, and so on. The 10 kW COIL has a very good beam quality which is 64 mm.mrad. The beam spot diameter is 0.48 mm at the focal point. On the contrary the beam quality of Nd:YAG laser is worse, but it has the function of pulse modulation which the COIL dose not have. As a result of the welding test with the 6 kW Nd:YAG laser, it was clarified that the pulse wave (PW) has good efficiency of deeper penetration at low welding speed. When the combined beam with CW COIL and PW Nd:YAG laser was used, 20 mm penetration on the stainless steel could be achieved at a welding speed of 1 m/min.

Citation Download Citation

Fumio Wani, Tokuhiro Nakabayashi, Akiyoshi Hayakawa, Sachio Suzuki, and Kozu Yasuda "High-power COIL and YAG laser welding", Proc. SPIE 4631, Gas and Chemical Lasers and Intense Beam Applications III, (6 May 2002); https://doi.org/10.1117/12.465774

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