WELDING TORCH WITH UPPER AND LOWER SHIELDING GAS FLOW AND WELDING METHOD USING WELDING TORCH FOR HORIZONTAL WELDING

摘要

A welding torch (1) includes a cylindrical nozzle (2) in which shielding gas is flown from an opening (3b), and an electrode (4) that is a bar-shaped body projecting from the opening (3b). The shielding gas includes upper shielding gas flowing in an upper region (3u) on an upper side of a central axis (C2) of the electrode (4), and lower shielding gas flowing in a lower region (3d) on a lower side of the central axis (C2) of the electrode (4). Atmospheric pressure of the lower shielding gas is higher than atmospheric pressure of the upper shielding gas. A method of horizontal welding with this kind of welding torch is also defined.