Fundamental study of laser cutting using high-speed photography

Takashi Fushimi; Hideyuki Horisawa; Shigeru Yamaguchi; Nobuo Yasunaga; Tomoo Fujioka

doi:10.1117/12.377059

7 February 2000 Fundamental study of laser cutting using high-speed photography

Takashi Fushimi, Hideyuki Horisawa, Shigeru Yamaguchi, Nobuo Yasunaga, Tomoo Fujioka

Proceedings Volume 3888, High-Power Lasers in Manufacturing; (2000) https://doi.org/10.1117/12.377059
Event: Advanced High-Power Lasers and Applications, 1999, Osaka, Japan

Abstract

Transient action of molten metal during laser cutting process in a kerf using different assist gases was experimentally observed. In the experiments, we used a typical mild steel sheet with a thickness of 4.4 mm. A nearly dross-free condition with oxygen as an assist gas is at a scanning speed of 1000 mm/minute, CO₂ laser power of 600 W pressure of an assist gas 0.15 MPa, while with air a scanning speed of 300 mm/minute, CO₂ laser power of 800 W and assist gas pressure of 0.4 MPa were used. Motions of molten metal in a kerf were captured with a high-speed digital CCD camera at a maximum frame rate of 18000 frames per second. As results, we found very bright portion (presumably higher temperature portion) in an erosion front moving toward bottom of a kerf. For oxygen as an assist gas, the portion was moved with a periodic action with a time interval of every 2.22 ms. While air was used, the motion was observed to be every 18.6 ms corresponding to ten times as long as obtained with oxygen as an assist gas.

Citation Download Citation

Takashi Fushimi, Hideyuki Horisawa, Shigeru Yamaguchi, Nobuo Yasunaga, and Tomoo Fujioka "Fundamental study of laser cutting using high-speed photography", Proc. SPIE 3888, High-Power Lasers in Manufacturing, (7 February 2000); https://doi.org/10.1117/12.377059

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