高張力鋼熔接変質部の冷却状況と顕微鏡組織および硬度(第3報) : V型およびT型接手について

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Authors made a series of investigation on structure and hardness of heat-affected zone, welding with single-V-butt and T-joint which are used generally in welding industries. In this report the softening effect caused by subsequent welding in the neighbourhood of the first pass was examined. On the other hand, an investigation for completely welded specimens was made in case of above mentioned joints. In single-V-butt joint, the maximum hardness of heat-affected zone was observed in the neighbourhood of last pass, while in the neighbourhood of root pass softening was caused with the heat effect of subsequently welded passes. In T type fillet joint, softening was little and the hardness of heat-affected zone was lowered slightly, when the microstructure consisted of martensite mostly. The relation between cooling curves and microstructure in the heat-affected zone of T-joint agreed with that of the second report on high tensile Mn-Si steel (Fig. 9). With reference to hardness, however, lower values were comfirmed in this report, and this fact is considered to be attributable to the use of coated electrode of low hydrogen type. Among all the welded joints investigated, the heat-affected zone of single fillet T-joint showed the highest hardness on account of rapid cooling, and the heat-affected zone of single bead, manually arc welded, shown next higher value. The hardness of that of single bead submerged arc welded, or singleV-butt ioint manuallv arc welded was lower.
1958-02-25

高張力鋼熔接変質部の冷却状況と顕微鏡組織および硬度(第3報) : V型およびT型接手について

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