Controlling nozzle and kerf gas dynamics to manage hazardous laser cutting fume

Conventional laser cutting is optimized for cut speed and quality but does not consider process fume. When processing hazardous materials in environments where global extraction practical, such as during situ nuclear decommissioning, consideration of fume critically important. Fume generation governed by forces applied to the molten front; dynamic interactions between assist-gas front control these forces. This paper investigates causal links key gas-dynamic features mechanisms cutting. Its aim provide preliminary understanding required design setups targeted at reducing fine particle fraction. During cutting, boundary layer separates (BLS) from and, therefore, downstream on melt are significantly changed. In this work, BLS point analyzed, captured via schlieren imaging, an idealized environment. separation related wall laser-cut samples, validating interactions. The samples were 3 mm thick 304 stainless steel, using a 1 kW Nd:Yb fiber laser. Control surface stagnation pressure gas flow conditions used relocate within front, relationship parameters was analyzed. results demonstrate that shifting along can be mechanisms. study successfully provided necessary manage process.