Author(s)

M. Law & W. Payten

Abstract

The operation of high temperature plant is often terminated by localised creep damage of welded joints. Despite its economic significance, weld performance under creep is poorly understood. The creep life of welds cannot be directly predicted by the properties of individual parts of the weld. Numerical modelling of creep processes in welded joints provides a method of predicting creep performance and life. 1 Introduction Component failure at high temperature often results from local failure in welded joints. These weld failures occur at stresses below the apparent creep rupture strengths of the parent or weld materials (Tu Creep is a progressive, time dependent deformation. In metals it occurs under stress at temperatures greater than approximately 0.4 of the absolute melting temperature. Typical curves of strain against time are shown in fig.l. During creep, internal dama

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