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.
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May 1986
Research Papers
Stress Redistribution During Local Annealing of a Multi-Pass Butt-Welded Pipe
B. L. Josefson
B. L. Josefson
Division of Solid Mechanics, Chalmers University of Technology, Go¨teborg, Sweden
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B. L. Josefson
Division of Solid Mechanics, Chalmers University of Technology, Go¨teborg, Sweden
J. Pressure Vessel Technol. May 1986, 108(2): 125-130 (6 pages)
Published Online: May 1, 1986
Article history
Received:
November 2, 1983
Revised:
February 11, 1985
Online:
November 5, 2009
Citation
Josefson, B. L. (May 1, 1986). "Stress Redistribution During Local Annealing of a Multi-Pass Butt-Welded Pipe." ASME. J. Pressure Vessel Technol. May 1986; 108(2): 125–130. https://doi.org/10.1115/1.3264759
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