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RESEARCH PAPERS

Stress Redistribution During Local Annealing of a Multi-Pass Butt-Welded Pipe

[+] Author and Article Information
B. L. Josefson

Division of Solid Mechanics, Chalmers University of Technology, Göteborg, Sweden

J. Pressure Vessel Technol 108(2), 125-130 (May 01, 1986) (6 pages) doi:10.1115/1.3264759 History: Received November 02, 1983; Revised February 11, 1985; Online November 05, 2009

Abstract

Stress redistributions during local Post Weld Heat Treatments (PWHT) are numerically studied for a multi-pass butt-welded pipe with mechanically unrestrained ends. The pipe material is a micro-alloyed C-Mn steel. Temperature and stress fields developed during welding and PWHT are determined from a FE-analysis where rotational symmetry is assumed. Use of heaters with a total axial width less than four times the pipe wall thickness is found to result in substantially different final stress fields than those obtained after a uniform (furnace) heat treatment. The tensile axial and hoop stresses on the inner pipe surface near the centre section of the weldment are considerably higher after a local PWHT. The differences were found to arise mainly during the cooling periods of the PWHTs.

Copyright © 1986 by ASME
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