Spectroscopic Analysis of Blue Diode Laser Induced Plume Generated by Welding of Pure Copper

Highly efficient and high quality pure copper welding with the blue diode laser, which has high optical absorption into pure copper, is expected to be realized. It is necessary to clarify the interaction between copper and laser beam when a blue diode laser is focused and irradiated on pure copper, and we focused on the blue diode laser-induced plume generated during copper welding. In this study, as a basic research to elucidate the interaction between the laser beam and the blue diode laser induced plume generated during welding of pure copper, spectroscopic analysis of the plume was performed to identify the plume constituent elements and their spatial distribution was experimentally clarified. The emission lines in the spectra were found to be Cu and CuO, indicating that the composition of the plume varies spatially.