Torch for gas shielderd arc welding using consumable electrode

摘要

A welding torch (10) comprises a torch body (20) having a wire guide cylinder (21) for guiding a welding wire (11); an internal cylinder (30) fitted to the torch body in such a manner as to surround the wire guide cylinder; and an external cylinder (40) fitted to the internal cylinder in such a manner as to surround the internal cylinder. The primary interception of outside air is effected with a second shielding gas layer (55) blown off from a second gas passageway (52) on the outer side, and the complete interception of outside air is effected with a first shielding gas layer (54) blown off from a first gas passageway (51) on the inner side. Consequently, it is made possible thereby to sufficiently prevent outside air from reaching a molten pool and also sufficiently suppress the generation of an unfavorable surface oxide, thus enabling welding work to be satisfactorily practiced by using the above welding torch.