NARROW GROOVE WELDING TORCH, NARROW GROOVE WELDING METHOD AND NARROW GROOVE WELDING SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a narrow groove welding torch, a narrow groove welding method and a narrow groove welding system, weldable by maintaining a stable shield gas atmosphere, by preventing contact with a work in a narrow groove even if a torch angle is changed.;SOLUTION: A narrow groove welding torch comprises a torch gun barrel 11, a nozzle 15 installed in the torch gun barrel 11 and jetting shield gas toward a welding part and a contact tip 14 for guiding a feeding welding wire 30. The nozzle 15 is a double structure nozzle having an inner nozzle 16 and an outer nozzle 17 arranged on the outer peripheral side of the inner nozzle 16, and the contact tip 14 projects by 10 mm or more from the tip of the inner nozzle 16.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2018,JPO&INPIT