The Paton Welding Journal, 2013, №08



2013 №08 (04)

2013 №08 (06)

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The Paton Welding Journal, 2013, #8, 31-36 pages  

CALCULATION OF PARAMETERS OF EXPLOSION TREATMENT FOR REDUCTION OF RESIDUAL STRESSES IN CIRCUMFERENTIAL WELDS OF PIPELINES

A.G. BRYZGALIN

E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
 
Abstract
Reduction of residual stresses in circumferential welds of pipelines is laborious and expensive process. Explosion treatment as an alternative to heat-treatment provides for significant time and expenses reduction. Experiment-calculation method is developed for determination of modes of explosion treatment of circumferential pipe welds of different dimension-type. The method is based on application of general form dependence of deformation of cylindrical shell wall on external static load, obtained in scope of elasticity theory, applicable to solution of problem on determination of value of dynamic load necessary for development of plastic strains, providing reduction of residual stresses in circumferential pipe welds. Dependences for calculation of main parameters of explosion treatment are derived based on this method. Experimental investigations verifying suitability of obtained dependencies for practical application without participation of technology developers were carried out. 13 Ref., 2 Tables, 3 Figures.
 
 
Keywords: explosion treatment, heat treatment, residual stresses, deformations, circumferential weld, pipelines
 
 
Received:                01.04.13
Published:               28.08.13
 
 
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