大脚長すみ肉溶接部に発生するラメラーティヤリングについて

概要

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For the prupose of examining the causes of lamellar tearing occurrence in multirun fillet welds, we have carried out various experiments, such as restraint cracking test for measuring various reaction stresses through the plate thickness, measurement of cracking time and hydrogen charged test. The test results are summarized as follows : (1) Critical reaction stress for lamellar tearing decreased with the increase of diffusible hydrogen contents in weld metal. (2) Lamellar tearing occurred at temperature below 100℃. (3) The delayed fracture phenomenon of lamellar tearing could be reproduced from hydrogen charged test. (4) From (1) (2) (3), lamellar tearing is considered a cold crack due to hydrogen embrittlement. (5) The relation among diffusible hydrogen, restraint and materials associated with lamellar tearing were shown in Fig. 14.
1972-05-25