Weld Cracking Behavior of 100kg/mm^2 High Strength Steel By Large Size Restraint Testing Machine

概要

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Various kinds of weld cracking testing methods such as Tekken type and Lehigh type have been developed to study weld cracking phonomena and mechanism and many useful investigations are conducted. The testing methods, however, have a weak point in the difficulty to obtain the restraint condition in quantitatively. To eliminate such weakness, the restraint cracking testing methods such as RRC and TRC tests have been developed. Even these testing methods have the following limitations : (a) it is difficult to reproduce the restraint force for a wide range as encountered in actual structures, (b) small sized cracking tests are liable to have some size effect on the test results. For the purpose to remove the above mentioned weak points, the authors have developed a testing machine of 2, 000 tons capacity for the use of cracking test of a wide and heavy section plate. Using this machine, the authors conducted one pass and multi pass weld cracking tests of high strength steel of 100kg/mm^2 in tensile strength and investigated the effect of the preheat temperature and restraint force on weld crack and the correlation between small size cracking test and large size cracking test.
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