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Evaluation of Secondary Contamination in Laser Cutting of Surface-contaminated Metals

机译：对表面污染金属激光切割中次污染的评价

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We investigated the mixing of simulated surface contamination in the cut surfaces of laser-cut stainless steel. A 10 #mu#m layer of molybdenum was coated by wire explosion spraying onto the surface of 8mm-thick 304L stainless steel to serve as the simulated contaminated metal plate. The cutting was done with a CO_2 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 results 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.
机译：我们调查了激光切割不锈钢切割表面中的模拟表面污染的混合。通过喷射喷射到8mm厚的304L不锈钢表面的钢丝爆炸到8mm厚的304L不锈钢表面，用作模拟污染金属板。使用氮气和氧气混合物作为切割辅助气体，用CO_2激光器用CO_2激光切割切割。通过EPMA表面分析和荧光X射线分析评估钼将钼混合到切割壁中。结果表明，随着辅助气体中的氧气浓度增加，将钼混合到切割表面中的程度降低。此外，通过化学氧化还原污垢处理从切割污染物中除去的结果是氧化越大，加工后残留的钼越少。因此，为了减少切割表面中的模拟表面污染物的混合，应该使用具有高浓度氧的切割辅助气体。

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