Evaluation of secondary contamination in laser cutting of surface-contaminated metals

Kunimitsu Takahashi; Shunichi Sato; Tadashi Fukushima; Akira Sano; Yasuhisa Ikeda; Yoich Takashima

doi:10.1117/12.375209

14 January 2000 Evaluation of secondary contamination in laser cutting of surface-contaminated metals

Kunimitsu Takahashi, Shunichi Sato, Tadashi Fukushima, Akira Sano, Yasuhisa Ikeda, Yoich Takashima

Proceedings Volume 3887, High-Power Lasers in Civil Engineering and Architecture; (2000) https://doi.org/10.1117/12.375209
Event: Advanced High-Power Lasers and Applications, 1999, Osaka, Japan

Abstract

We investigated the mixing of simulated surface contamination in the cut surfaces of laser-cut stainless steel. A 10 micrometers layer of molybdenum was coated by wire explosion spraying of 8mm-thick 304L stainless steel to serve as the simulated contaminated metal plate. The cutting was done with a CO₂ laser using a nitrogen and oxygen gas mixture as cutting assist gas. The mixing of the molybdenum into the cut walls was evaluated by EPMA surface analysis and fluorescent x-ray analysis. The result revealed that the degree to which the molybdenum was mixed into the cut surfaces decreased as the concentration of oxygen in the assist gas increased. Also, the result of contaminant removal from the cut piece by chemical oxidation reduction decontamination processing was that the greater the oxidation, the less the molybdenum that remained after the processing. Thus, to reduce the mixing of simulated surface contaminants in the cut surfaces, a cutting assist gas that has a high concentration of oxygen should be used.

Citation Download Citation

Kunimitsu Takahashi, Shunichi Sato, Tadashi Fukushima, Akira Sano, Yasuhisa Ikeda, and Yoich Takashima "Evaluation of secondary contamination in laser cutting of surface-contaminated metals", Proc. SPIE 3887, High-Power Lasers in Civil Engineering and Architecture, (14 January 2000); https://doi.org/10.1117/12.375209

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