(1995 Vol.27-No.6)Weld repair of creep damaged steels

摘要

A Cooperative Research Centre project "'Welding of Thermally Modified Structures" was commenced in June 1993 with support from ANSTO, CSIRO, BHP, University of Wollongong and the CRCfor Materials, Weldinjj and Joining. The main aims of the project are to quantify the effects of performing repair welds on materials which have operated for extended periods at elevated temperature. Welding is an increasingly used method for performing repairs, replacements, retrofits and modifications to elevated temperature plant, however, the effects of these repairs on the ultimate life of a component are poorly understood. Tins paper presents details of the three ex-service materials chosen for the project, a carbon steel and two low alloy steels. Work is also presented on development of new methods of assessing materials and components both destructively and non-destructively, along with new methods of modelling welded components in high temperature service.