Revised Cold Cracking Parameter P_<HA> and its Applications

概要

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In the author's previous report IIW IX-1232-82, a new and generalized cold cracking parameter was introduced, so that the conditions leading to various types of hydrogen-induced cracking in welded high-strength steels can be analyzed and predicted using the data obtained from the standard JIS-y (Tekken type) cracking test. In this report, the P_<HA> formula has been made more accurate using additional JIS-y test data. Additional information and figures are presented to make the P_<HA> application procedure more accessible. Verification of the effectiveness of P_<HA>-analysis has been made through several tests such as on the effect of groove shape and eccentric weld location, single-bevel groove RRC test by Fikkers and Muller, heel cracking test by Tanaka and Kitada, critical maximum hardness in JIS-y test, Harasawa-Hart test, and Yurioka single-bevel groove 30 kJ/cm test. It is also shown that P_<HA> parameter is practically identical to Yurioka cracking index CI for lower carbon content range, and P_<HA> becomes identical to Ito-Bessyo cracking parameter P_w, in the case of severe restraint in JIS-y test, but P_<HA> has wider fields of applications.
社団法人溶接学会の論文
1985-04-01