溶接学会論文集
Print ISSN : 0288-4771
繰返し荷重下における溶接施工性の検証
-供用下における鋼橋の溶接による補修・補強に関する研究-
上野 康雄李 相亨藤平 正一郎金 裕哲
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ジャーナル フリー

2010 年 28 巻 4 号 p. 436-442

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In welded structures, it is thought that the crack in welds may be related to collapse of structure. So, the investigation on the relation between weld crack and acting loads in repair/reinforcement work by welding are performed. There are three kinds of load conditions in welding of the site: no loads, static loads and fluctuated loads.
In the previous paper, welding under static loads were carried out, it was confirmed that weld crack was not generated. In this case, installation of bents and traffic control were required. So, concerning to the social and economical situation, welding under fluctuated loads without traffic control was desirable.
In this paper, performing CO2 arc welding under cyclic loads on the assumption that fluctuated loads, examinations for detection of the crack were carried out. The hot cracks were observed at I-type joints. From the results of fractography, projections of cellular dendrite and striations were observed. And it was known that the magnitude of root gap opening displacement (Δδ) and heat input (Q) were induced the hot crack in the weld metal.

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