溶接ボンド部の熱ひずみぜい化に関する研究(第 2 報) : BNP 試験と PBC 試験におけるぜい化度の比較

概要

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A new test (the so called BNP test) has been proposed to evaluate the susceptibility of coarse grained HAZ to hot straining embrittlement by the authors. In this paper, to confirm the competence of the BNP test, the correlation between the degree of embrittlement in BNP test and that in PBC (pre-compression bending COD) test proposed by Satoh et al. has been investigated. The tests have been made on the coarse grained HAZ in HT 80 and SM 50 steels as a function of welding heat input. Results can be summarized as follows. (1) Transition temperatures (Trs) by BNP test shows a good correlation with Trs by PBC. (2) The increment of the transition temperature (ΔTrs) by hot straining embrittlement in BNP test shows good correlation with ΔTrs in PBC test. (3) Since the PBC test holds a close correlation with the Wells-Kihara wide plate test, an analogous situation may be expected for the BNP test.
1980-07-05