熔接熱サイクル再現装置による鋼の熱影響部の冶金的研究 (第2報) : 最高硬度の簡易試験について

概要

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A simpliffed weld maximum hardness test with a taper bar specimen was introduced using a reproducing apparatus of weld thermal cycles. The specimen, 14mm in diameter and 150mm in length, was heated with a heavy current until the smallest section of the specimen melted away, and then the specimen was cooled in a still air. The dimentions of the taper bar specimens was selected so that the heating and cooling cycles at various positions along the specimen axis might be simulated closely with those in the heat affected zone of a standard bead weld. From the results of the simplified weld maximum hardness test made on six structural steels, the hardness and microstructures produces on the taper bar specimens agreed well with those obtained in welded specimens, However, the disagreement in hardnesses between the weld and the taper bar specimens in those few steels was proved to be due to the difference of the holding time at the peak value of heat treating temperature. Thus. the simplified tests was found to be effective to estimate the weld maximum hardness of steels, without requiring a large size of weld hardness test specimen.
社団法人溶接学会の論文
1957-05-25