TITLE

ASSESSMENT OF EFFECTIVENESS OF RESIDUAL STRESS LOWERING IN CIRCUMFERENTIAL JOINTS OF PIPES AFTER POSTWELD EXPLOSION TREATMENT

AUTHOR(S)
BRYZGALIN, A. G.
PUB. DATE
May 2014
SOURCE
Paton Welding Journal;May2014, Issue 5, p48
SOURCE TYPE
Trade Publication
DOC. TYPE
Article
ABSTRACT
It is established that at application of earlier developed procedure of calculation of explosion treatment modes for pipe circumferential joints the extent of residual stress lowering depends on their initial level. In particular, at explosion treatment of pipes without the circumferential weld the induced compressive stresses are essentially lower than welding stresses, whereas the latter are practically completely relieved at treatment of welds of similar pipes by the same modes. Scatter of induced compressive stresses in pipes of different typesizes did not exceed the measurement error. Dependence of explosion treatment effectiveness on the magnitude of initial welding stresses was determined, which is of a nonlinear nature. Presence of such a dependence allows prediction of treatment results and correction of modes depending on requirements made of treatment results. Fundamental difference of the mechanisms of residual stress lowering at heat treatment and explosion treatment is shown.
ACCESSION #
96892278

 

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