Prevention Against Cold Cracking by the Hydrogen Accumulation Cracking Parameter P_<HA>

概要

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In our previous report IIW IX-1195-81, a new formula for cracking parameter PHA was introduced in order to analyze and predict the critical conditions leading to various types of hydrogen-induced cold cracking in welded high-strength steels. In this report, the formula for PHA has been given in a more reasonable form by means of a different and simpler procedure for its introduction and by adopting a more rigorous formula for the intensity of restraint of the JIS-y test specimen. The idea of equivalent intensity of restraint REy, which directly concerns the magnitude of local stress concentration near the root of a one-pass weld in a butt-joint, has proven to be very useful in explaining quantitatively the effects of various groove shapes and eccentric weld locations on the values of critical cooling time for the prevention of root cracking. Moreover, experimental findings on heel cracking (HAZ root cracking in a short fillet weld in a T-joint) of HT50 steels are satisfactorily explained by PHA analysis. Nomographs and figures are supplied for calculating PHA, cooling times and preheating temperatures.
社団法人溶接学会の論文
1983-04-01