強靭鋼材の熔接割れに就いて(第 2 報) : 熔接部の横拘束度と熔接縱割れとの關係
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概要
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If a construction is mae of steel by welding, some contraction of length occurs generally. When base metal plates are restrained externaly and the free contraction is prevented, extrcardinary large welding-stresses arise in comparison with the case in which base metal plates are held freely. Undoubtedly, the stress induced by welding becomes large in accordance with the large restraint-degree, in the extreme, weldments do crack. In this research, the author prepared many rectangular special specimens made of an alloy steel. The form of such special specimens was deviced by the author. Next, he arcwelded the V-groove in the center of the specimen and investigated the relation between the probability for the occurrence of longitudinal cracks in the weld metal or in the heat-affected zone and the length of the parallel part of the base metal which is perpendicular to the bead line and parallel to the plate surface. And the following results were obtained. Namely, these cracks are apt to occur in the welded construction of which parallel part is shorter. In other words, longitudinal cracks, which are parallel to the bead line and exist in the weld metal or in the heat-affected zone, are apt to occur in the case which the lateral restraint-degree, that is, the restraint-degree in the direction perpendicular to the bead line, is larger. Further, in this research, using θ-form specimens which professor Y. Tanaka proposed, the author made an experiment, and confnmed the following facts. The larger the cross section of the groove welded is, the larger the amount of the lateral contraction by welding becomes. In the case in which the area of cross section of the groove is constant, the lateral contraction by welding changes according to the electrode or the condition of the weld-deposition. Owing to these results, the following supposition may readily be made. Namely, if sections of the groove to be welded and weldingelectrodes, which result in large lateral deformations, are applied to the welding of the part of construction which is under large restraint, longitudinal cracks in the weld metal or in the heat-affected zone may be apt to occur.
- 社団法人溶接学会の論文
- 1948-12-01
著者
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