Low transformation temperature (LTT) weld fillers can be used to replace tensile weld residual stresses with compressive ones and reduce the distortion of single-pass welds in austenitic plates. By contrast, weld fillers in multipass welds experience a number of thermal excursions, meaning that the benefit of the smart LTT fillers may not be realised. Here, neutron diffraction and the contour method are used to measure the residual stress in an eight pass groove weld of a 304 L stainless steel plate using the experimental LTT filler Camalloy 4. Our measurements show that the stress mitigating the effect of Camalloy 4 is indeed diminished during multipass welding. We propose a carefully selected elevated interpass hold temperature and demonstrate that this restores the LTT capability to successfully mitigate residual tensile stresses.
This paper is part of a thematic issue on Nuclear Materials.
WithersPJ.Residual stress and its role in failure. Rep Prog Phys. 2007;70:2211–2264. doi: 10.1088/0034-4885/70/12/R04.
2.
FrancisJ, BhadeshiaHKDH, WithersPJ.Welding residual stresses in ferritic power plant steels. Mater Sci Technol. 2007;23:1009–1020. doi: 10.1179/174328407X213116.
3.
TurskiM, BouchardPJ, SteuwerA, Residual stress driven creep cracking in AISI Type 316 stainless steel. Acta Mater. 2008;56:3598–3612. doi: 10.1016/j.actamat.2008.03.045
4.
WangW, HuoL, ZhangY, New developed welding electrode for improving the fatigue strength of welded joints. J Mater Sci Technol. 2002;18:527–531.
5.
OhtaA, SuzukiN, MaedaY, Superior fatigue crack growth properties in newly developed weld metal. Int J Fatigue. 1999;21:113–118. doi: 10.1016/S0142-1123(99)00062-6
6.
ShirzadiAA, BhadeshiaHKDH, KarlssonL, Stainless steel weld metal designed to mitigate residual stresses. Sci Technol Weld Join. 2009;14:559–565. doi: 10.1179/136217109X437178.
7.
FrancisJA, StoneHJ, KunduS, Transformation temperatures and welding residual stresses in ferritic steels. ASME Press Vessel Pip. 2007: 949–956. doi: 10.1115/PVP2007-26544
8.
RamjaunTI, StoneHJ, KarlssonL, Surface residual stresses in multipass welds produced using low transformationtemperature filler alloys. Sci Technol Weld Join. 2014;19, doi: 10.1179/1362171814Y.0000000234
9.
RamjaunT, StoneHJ, KarlssonL, Effect of interpass temperature on residual stresses in multipass welds produced using low transformation temperature filler alloy. Sci Technol Weld Join. 2014;19, doi: 10.1179/1362171813Y.0000000162
10.
DaiH, FrancisJA, StoneHJ, Characterizing phase transformations and their effects on ferritic weld residual stresses with X-rays and neutrons. Metall Mater Trans A: Phys Metall Mater Sci.2008;39: 3070–3078. doi: 10.1007/s11661-008-9616-0
11.
MurakawaH, BérešM, DaviesCM, Effect of low transformation temperature weld filler metal on welding residual stress. Sci Technol Weld Join. 2010;15:393–399. doi: 10.1179/136217110X12714217309614
12.
MoatRJ, StoneHJ, ShirzadiAA, Design of weld fillers for mitigation of residual stresses in ferritic and austenitic steel welds. Sci Technol Weld Join. 2011;16:279–284. doi: 10.1179/1362171811Y.0000000003
13.
ThibaultD, BocherP, ThomasM, Residual stress characterization in low transformation temperature 13%Cr–4%Ni stainless steel weld by neutron diffraction and the contour method. Mater Sci Eng A. 2010;527:6205–6210. doi: 10.1016/j.msea.2010.06.035
14.
DixneitJ, KrommA, HannemannA, In-situ load analysis in multi-run welding using LTT filler materials. Weld World. 2016;60:1159–1168. doi: 10.1007/s40194-016-0373-1
15.
DixneitJ, KrommA, BoinM, Residual stresses of LTT welds in large-scale components. Weld World. 2017;61:1089–1097. doi: 10.1007/s40194-017-0502-5
16.
RamjaunTI, StoneHJ, KarlssonL, Effects of dilution and baseplate strength on stress distributions in multipass welds deposited using low transformation temperature filler alloys. Sci Technol Weld Join. 2014; doi: 10.1179/1362171814Y.0000000209
17.
DaiH, MarkAF, MoatRJ, Modelling of Residual Stress Minimization through Martensitic Transformation in Stainless Steel Welds. GRAZ, Austria. in: 9th Int. Semin. Numer. Anal. Weldability, Graz. 2009;239–252.
18.
DaiH, MoatRJ, WithersPJ.Modelling the interpass temperature effect on residual stress in low transformation temperature stainless steel welds. Am Soc Mech Eng Press Vessel Pip Div PVP. 2011. doi: 10.1115/PVP2011-57329
19.
WithersPJ.Mapping residual and internal stress in materials by neutron diffraction. Comptes Rendus Phys.2007;8:806–820. doi: 10.1016/j.crhy.2007.09.015.
20.
WithersPJ, JohnsonMW, WrightJS.Neutron strain scanning using a radially collimated diffracted beam. Phys B: Condens Matter. 2000;292:273–285. doi: 10.1016/S0921-4526(00)00481-6.
21.
WithersPJ, PreussM, SteuwerA, Methods for obtaining the strain-free lattice parameter when using diffraction to determine residual stress. J Appl Crystallogr. 2007;40:891–904. doi: 10.1107/S0021889807030269
22.
HughesDJ, HattinghMNJDG, WebsterPJ.The use of combs for evaluation of strain-free references for residual strain measurements by neutron and synchrotron X-ray diffraction. J Neutron Res. 2003;11:289–293. doi: 10.1080/10238160410001726765
23.
DaymondMR, BourkeM, Von DreeleRB, Use of rietveld refinement for elastic macrostrain determination and for evaluation of plastic strain history from diffraction spectra. J Appl Phys. 1997;82:1554–1562, doi: 10.1063/1.365956
PrimeMB, HillMR, DeWaldA, Residual stress mapping in welds using the contour method. Trends Weld Res Proc. 2002;836:891–896. doi:10.4028/www.scientific.net/MSF.490-491.294
26.
MarkAF, MoatR, ForseyA, A new method for quantifying anisotropic martensitic transformation strains accumulated during constrained cooling. Mater Sci Eng A. 2014;611, doi: 10.1016/j.msea.2014.06.012
27.
ElcoateCD, DennisRJ, BouchardPJ, Three dimensional multi-pass repair weld simulations. Int J Press Vessel Pip.2005;82:244–257. doi: 10.1016/j.ijpvp.2004.08.003.
28.
FrancisJA, StoneHJ, KunduS, The effects of filler metal transformation temperature on residual stresses in a high strength steel weld. J Press Vessel Technol ASME. 2009;131:041401), doi: 10.1115/1.3122036.
