ARC WELDING METHOD AND PLASMA TORCH

摘要

Provided is an arc welding method in which inward from shield gas (SG) that is sprayed in a circular shape from second nozzles (12) towards a first and a second workpiece, an inert gas (FG) is sprayed from third nozzles (13) towards a tip surface (11c) of a first nozzle (11), and an inert gas layer is formed. This configuration prevents fume generated from a workpiece surface from adhering to the tip surface (11c) of the first nozzle (11), stabilizes weld quality, and suppresses a reduction in nozzle durability.