On the Method for Evaluating the Sensitivity to Reheat Cracking in the Weld Zone of Steel

Abstract

The present authors have assumed that the sensitivity of steel to reheat cracking can be most appropriately evaluated by its own plastic deformability.Based on this assumption, the authors undertook a study of reheat cracking testing of steel by means of the stress relieving test, and of the method for evaluating the sensitivity of steel to reheat cracking.The results of the study obtained are summaraized as follows:(1) The reheat cracking test method using the weld thermal-restraint stress and the straincycle simulator has the advantage in that it allows the test to be made continuously during the heating and holding processes.

Method for Evaluating the Sensitivity of Steel to Reheat Cracking by the Synthetic Weld HAZ

“…(2) As compared the results of the reheat cracking test with the test specimens for the synthetic HAZ and the weld reinforced test specimens as stated in the previous report (1), there is good correspondence in the cracking phenomenon and cracking sensitivity between the two test specimens. …”

“…Comparing the result of the reheat cracking test for specimens with a reinforced weld zone in the previous report (1) Taking the above into account the conditions of reheat cracking must be determined. However, as the strength of refining low alloy steel is adjusted by quenching and tempering, the strength is liable to decrease when the reheat treatment temperature is high.…”