WELDING DEVICE FOR NARROW GROOVE

PROBLEM TO BE SOLVED: To provide a welding device for a narrow groove capable of imaging a clear image, by adopting a bore scope for imaging a welding part.SOLUTION: A welding device 1 for a narrow groove comprises: welding means for welding an electrode 11 projecting from the tip of a welding torch 10, and a narrow groove formed in a base material by generating an arc between the base material and a welding bead; a wire torch 50 for supplying an addition wire 41 to the welding part; gas shield means 20 for shielding the welding part from outside air by making inert gas flow to the vicinity of the welding part W; and imaging means 30 for imaging an image for monitoring the welding part W. The imaging means 30 comprises the bore scope 33 partially inserted into the narrow groove, and arranged between the welding torch 10 and the wire torch 50, and is provided with a common installation member 4 for installing the bore scope 33 and the wire torch 50, and a variable fixing mechanism for fixing the installation member 4 to a base member 3 for supporting this installation member 4 so that a position can be adjusted in the length direction of the narrow groove.