Creep Rupture of Mismatched Welded Joints of Steels with Dissimilar Creep Strengths

摘要

The finite element analysis of mismatched welded joints with a 30~0 groove angle was performed to study the mechanical behavior of DMWJs (dissimilar metal welded joints). It is concluded that the distribution of stress triaxiality in the DMWJs is uneven, especially near the fusion lines. The degree of creep strength mismatch has remarkable effect on the distribution. The higher the level of mismatch is, the more uneven the distribution is and the easier for Premature failure to occur in the joint.