| 摘要 |
PROBLEM TO BE SOLVED: To provide a narrow groove arc welding method in which the penetration of a groove side wall and a groove bottom part can be secured, and at the same time, the creeping-up of an arc on the groove side wall can be prevented even if a groove width is narrow, and also, an excellent back wave bead can be formed even if a backing material is not used. SOLUTION: In the narrow groove arc welding method in which welding is conducted by inserting an electrode wire 6 to be used for gas metal arc welding inside the narrow groove 1 formed on the butting end face of a member 5 to be welded, the groove width W in the vicinity of the generation of the arc of the electrode wire 6 is set to 6.0 mm or less, the thickness t of a root face 4 is set within a range of 1.0 mm-5.0 mm, and the welding is conducted in an open arc state that a weld droplet at the tip of the electrode wire 6 is not regularly and periodically short-circuit-transferred by using a welding power source 10 having an external characteristic of a constant current characteristic or a drooping characteristic.
|
