Patent ID: 9623508
Date: 2017-04-18
CPC Classifications: B23K

Claim:
1. A method for performing welding under fluctuating stress, the method comprising: measuring a first root opening width variation for a predetermined period of time before start of welding; setting a maximum value of the measured first root opening width variation as an allowable value; selecting, from among gas shielded arc welding consumables, a welding consumable having Mn/S and Mn/Si ratios configured such that the selected welding consumable is adequately crack resistant when the measured first root opening width variation is equal to the allowable value; measuring a second root opening width variation while welding is performed; if the second root opening width variation exceeds the allowable value, inspecting, after welding, a quality of only a welded joint formed at a time when the second root opening width variation was measured as exceeding the allowable value; and if the quality of the welded joint inspected differs relative to a predetermined value, repairing the welded joint.