Advanced

The extent of relaxation of weld residual stresses on cutting out cross-weld test-pieces

Altenkirch, J.; Steuwer, Axel LU ; Peel, M. J. and Withers, P. J (2009) In Powder Diffraction 24(2). p.31-36
Abstract
Weld residual stress (RS) measurements are often undertaken on test-pieces which have been Cut Out from large components, yet it remains unclear to what extent the RSs in test-pieces are representative of those present in the original component. Similarly weld mechanical performance tests are frequently undertaken on cross-weld test-pieces without a proper understanding of the level or influence of retained RS. We present a systematic study of the relaxation of longitudinal RS in thin-plate butt welds produced using different materials and welding methods (FSW, laser-MIG, and pulsed-MIG). In each case the RSs were measured repeatedly in the same location as the welds were progressively and symmetrically cut down. Although cutting... (More)
Weld residual stress (RS) measurements are often undertaken on test-pieces which have been Cut Out from large components, yet it remains unclear to what extent the RSs in test-pieces are representative of those present in the original component. Similarly weld mechanical performance tests are frequently undertaken on cross-weld test-pieces without a proper understanding of the level or influence of retained RS. We present a systematic study of the relaxation of longitudinal RS in thin-plate butt welds produced using different materials and welding methods (FSW, laser-MIG, and pulsed-MIG). In each case the RSs were measured repeatedly in the same location as the welds were progressively and symmetrically cut down. Although cutting inevitably leads to stress redistribution, significant relaxation of the longitudinal RS was only observed when the weld length or width was reduced to below a certain value. This critical value appears to correlate with the lateral width of the tensile zone local to the weld-line and may be considered to be the characteristic length as defined in St. Venant's principle. Further, it was found that the level of stress relaxation as a function of weld length for all the welds studied could be collapsed onto a single empirical curve using a simple approach based on the characteristic length scales of the weld. Given the range of materials and welding methods used, this relation appears to be of general use for thin-plate welds although further work is required to test the limits of its applicability. (C) 2009 International Centre for Diffraction Data. [DOI: 10.1154/1.3152580] (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
guidelines, St. Venant's principle, residual stress, stress relief
in
Powder Diffraction
volume
24
issue
2
pages
31 - 36
publisher
International Centre for Diffraction Data
external identifiers
  • wos:000267522500008
  • scopus:68149144258
ISSN
0885-7156
DOI
10.1154/1.3152580
language
English
LU publication?
yes
id
2916bf26-4e8e-4d28-8682-d146daff3ba8 (old id 1462932)
date added to LUP
2009-08-18 16:44:34
date last changed
2017-10-22 04:08:32
@article{2916bf26-4e8e-4d28-8682-d146daff3ba8,
  abstract     = {Weld residual stress (RS) measurements are often undertaken on test-pieces which have been Cut Out from large components, yet it remains unclear to what extent the RSs in test-pieces are representative of those present in the original component. Similarly weld mechanical performance tests are frequently undertaken on cross-weld test-pieces without a proper understanding of the level or influence of retained RS. We present a systematic study of the relaxation of longitudinal RS in thin-plate butt welds produced using different materials and welding methods (FSW, laser-MIG, and pulsed-MIG). In each case the RSs were measured repeatedly in the same location as the welds were progressively and symmetrically cut down. Although cutting inevitably leads to stress redistribution, significant relaxation of the longitudinal RS was only observed when the weld length or width was reduced to below a certain value. This critical value appears to correlate with the lateral width of the tensile zone local to the weld-line and may be considered to be the characteristic length as defined in St. Venant's principle. Further, it was found that the level of stress relaxation as a function of weld length for all the welds studied could be collapsed onto a single empirical curve using a simple approach based on the characteristic length scales of the weld. Given the range of materials and welding methods used, this relation appears to be of general use for thin-plate welds although further work is required to test the limits of its applicability. (C) 2009 International Centre for Diffraction Data. [DOI: 10.1154/1.3152580]},
  author       = {Altenkirch, J. and Steuwer, Axel and Peel, M. J. and Withers, P. J},
  issn         = {0885-7156},
  keyword      = {guidelines,St. Venant's principle,residual stress,stress relief},
  language     = {eng},
  number       = {2},
  pages        = {31--36},
  publisher    = {International Centre for Diffraction Data},
  series       = {Powder Diffraction},
  title        = {The extent of relaxation of weld residual stresses on cutting out cross-weld test-pieces},
  url          = {http://dx.doi.org/10.1154/1.3152580},
  volume       = {24},
  year         = {2009},
}