TIG WELD PENETRATION IMPROVEMENT BY LASER-ACTIVATED PROCESS WITH OXYGEN

摘要

This paper deals with a newly developed pretreatment for TIG arc welding to improve weld penetration. As a pre-treatment, a small oxidized region was produced on the surface of stainless steel plates by laser irradiation using oxygen gas prior to travelling TIG arc. The effect of the pre-treatment (especially named LA pre-treatment) on the TIG weld penetration was evaluated. It was found that the pre-treated region extremely smaller than the weld could make the TIG weld penetration deeper at lower welding speeds.