Theoretical Study on Transient Restraint Stress in Multi-pass Welding

概要

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The behavior of restraint stress during and after multi-pass welding of high strength steel is investigated experimentally by use of tensile restraint weld testing method. In addition, the transient restraint stress in multi-pass welding is discussed on the basis of the thermal-elastic theory. The conclusions obtained in this study are summarized as follows : (1) As the weld specimen is preheated to higher temperature, the final restraint force increases and interpass retraint force decreases. (2) In proportion to the number of pass increases, the restraint forces increase in final and interpass stages, but the restraint stresses decrease in both these stages. (3) The transient stress on restraint weld joint is possible to be calculated by summation of the simple equations based on the thermal elastic theory. (4) The effects of preheating temperature on restraint stress is also clarified by the calculation method proposed in this paper.
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