レーザ・アークハイブリッド溶接を用いた鋼床版Uリブ溶接部疲労き裂の補修

抄録

In this research, the applicability of laser-arc hybrid welding to repairs on fatigue cracks from welds between deck plates and trough ribs is investigated. Firstly, in order to decide laser-arc hybrid welding conditions, which are laser output, welding speed and current, welding examinations are conducted. Next, fatigue tests are performed to evaluate the fatigue strength of repaired welds by using laser-arc hybrid welding. Their tests results show that the repair method is effective in improving fatigue strength, and is feasible for repairs on fatigue cracks in the welds.