Gas shielding apparatus and gas shielding method

摘要

A gas shielding apparatus comprising a main gas jacket (10) having induction heating means, and front gas jacket (20) and rear gas jacket (30) integrally disposed at supply side and discharge side of a member (9) to be bonded or a member to be heated of the main gas jacket, wherein gas shielding is achieved by setting the internal pressure of the main gas jacket lower than the internal pressure of the front gas jacket and rear gas jacket, so that the holding time of the shielding gas jacket in the main gas jacket becomes long.