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Conventional welding processes, which rely upon the local melting and fusion of material, generate significant residual stress distributions in the weldment. The extent of these stresses can, under conditions of high restraint, approach the yield strength of either the parent or weld materials itself.
Post-weld heat treatment (PWHT) is applied to welded steel assemblies, with its primarily objective to reduce the possibility of brittle fracture. The benefits of post-weld heat treatment include a significant reduction of tensile residual stresses in the weld joint and, to a lesser extent, tempering of the heat-affected zone and the weld metal microstructures.
Post-weld heat treatment of C-Mn steels is typically carried out at approximately 600°C, for one hour per 25mm of thickness.
Masteel UK Limited in collaboration with a UKAS accredited laboratory can arrange simulated post-weld heat treatment of its products with fully documented heat treatment charts traceable to national standards.
Our clients can therefore be confident that the material supplied which may be subject to post weld heat treatment in production has already been certified in the required condition.
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Masteel UK Limited,
The Cedars, Coton Road,
Nether Whitacre, Coleshill,
Birmingham, West Midlands
B46 2HH
t: +44 (0)1675 437733
f: +44 (0)1675 437734
email: enquiries@masteel.co.uk
website: www.masteel.co.uk
blogsite: www.masteel.ning.com