Development and its Application of Weld Thermal-Restraint Stress and Strain-Cycles Simulator

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The weld thermal-restraint stress and strain-cycles simulator, briefly "Thermal Restraint Simulator or Thermorestor", which enables us to simulate various phenomena caused by welding, and to analyze separately the effects of each factor such as thermal cycles, restraint stress cycles, strain cycles and atmosphere upon materials, has been developed. It is confirmed that this apparatus can be applied to making clear weld cracking phenomena, to evaluation of weldability of base metal, to eslection of welding materials, to establishment of welding procedure, etc.. Examples of standard programs and their application tests for investigation of welding phenomena with this apparatus are as follows : 1) The program of a rigid restraint control during synthetic weld thermal cycles can make clear the weld hot crack sensitivity in the heat-affected zone of base metals. 2) By a program of an enforced strain control during synthetic weld thermal cycles the hot crack sensitivity and the propagation characteristics of micro-cracks of base metals or weld metals, can be investigated and the program is useful for selection of base metals or welding materials. 3) The program of a constant strain control during cooling of notched specimen charged with hydrogen at a high temperature can dissolve the phenomena of delayed cracking due to hydrogen, and is very useful for the evaluation of cold crack sensitivity during welding and delayed cracking characterisitc during operation. 4) The programs of an arbitrary controlled strain or stress during weld post-heat treatment can make clear stress relaxation and anneal cracking phenomena, and are used for the selectim of the conditions of stress relief heat treatment and the evaluation of anneal crack sensitivity of base metals.
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Development and its Application of Weld Thermal-Restraint Stress and Strain-Cycles Simulator

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