Modelling of Creep Behaviour in Welded Joints

摘要

This paper investigates the effect of filler material properties on the creep life behaviour of components. Of special interest would be the creep strain rate pf the weld material compared to the strain rate of the parent material. The paper concentrates on creep crack growth in weldments, weldment geometry and influence of state-of-stress. These topics are treated with respect to filler material properties relative to the base material. The paper shows that no general statement can be made, moreover this question should be answered on a case-to-case basis, since the conclusion is dependent upon geometry. It is further shown that Type Ⅳ cracking is controlled to a large extent by the properties of the weld material and the base material whereas the weak properties in the intercritical HAZ will not dominate the cracking process.