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

机译：激光切割表面污染金属的二次污染评估

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Abstract: We investigated the mixing of simulated surface contamination in the cut surfaces of laser-cut stainless steel. A 10 $mu@m layer of molybdenum was coated by wire explosion spraying of 8mm-thick 304L stainless steel to serve as the simulated contaminated metal plate. The cutting was done with a CO$-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 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. !2
机译：摘要：我们研究了模拟表面污染在激光切割不锈钢切割表面中的混合情况。通过对8mm厚的304L不锈钢进行线爆炸喷涂来涂覆10微米的钼层，以作为模拟的污染金属板。切割是通过使用氮气和氧气的混合气体作为切割辅助气体的CO $ -2 /激光器完成的。通过EPMA表面分析和荧光X射线分析评估钼在切面中的混合。结果表明，随着辅助气体中氧气浓度的增加，钼混入切割表面的程度降低。另外，通过化学氧化还原去污处理从切割片上去除污染物的结果是，氧化越大，处理后残留的钼越少。因此，为了减少模拟表面污染物在切割表面中的混合，应使用氧气浓度高的切割辅助气体。 ！2

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