Effect of high pressure rolling on weld-induced residual stresses

The formation of large residual stresses continues to be a problematic side effect of all common welding processes. In this work, localised high pressure rolling of gas metal arc welds to relieve these residual stresses has been investigated using strain gauging and neutron diffraction. Rolling was...

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Bibliographic Details
Published in:Science and technology of welding and joining 2012-07, Vol.17 (5), p.394-401
Main Authors: Coules, H E, Colegrove, P, Cozzolino, L D, Wen, S W, Ganguly, S, Pirling, T
Format: Article
Language:English
Subjects:
Equivalence
Gauging
Neutron diffraction
Residual stress
Residual stresses
Rolling
Side effects
Steel
Strain measurement
Tensile stress
Weld lines
Welding
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Summary:The formation of large residual stresses continues to be a problematic side effect of all common welding processes. In this work, localised high pressure rolling of gas metal arc welds to relieve these residual stresses has been investigated using strain gauging and neutron diffraction. Rolling was found to remove undesirable tensile stresses and even induce large compressive ones, though only when applied after rather than during welding. Strain measurements taken during combined welding and rolling operations show that this is because material at the weld line continues to yield as it cools. This erases any beneficial effect on the stress distribution of rolling at high temperature. A method of rolling using an oscillating force is also presented and found to be just as effective as the equivalent static force process.
ISSN:1362-1718
1743-2936
DOI:10.1179/1362171812Y.0000000021