An investigation into strain partitioning in mismatched HSLA-65 steel welds

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Journal titleJournal of Strain Analysis for Engineering Design
Pages95102; # of pages: 8
SubjectBase metals; Constitutive materials; Constitutive properties; digital image correlation; Digital image correlations; Displacement rate; Elastic modulus values; Failure locations; Failure strain; HSLA-65; Hydraulic tests; Steel welds; Strain partitioning; Weld filler materials; Weld nuggets; Weld zone; Yield strength; Extraction; Fillers; Image analysis; Quality assurance; Strain measurement; Three dimensional; Welding; Welds; Strain rate
AbstractThe aim of this study was to quantify strain partitioning in HSLA-65 joints, welded with three types of weld filler: 6011 undermatched weld filler, 7018 matched weld filler, and 9016 overmatched weld filler. Strain measurements were made using a three-dimensional digital image correlation system while specimens were tested on a displacement controlled servo-hydraulic test frame. Crosshead displacement rates ranged from 0.056 mm/s to almost 56 Coupons were cut from flux-core arc welded HSLA-65 plates to characterize the base metal, weld filler materials, and mismatched welds. Constitutive material properties could be extracted reliably for all coupons at the lowest displacement rate and showed that, as expected, all weld fillers had similar elastic modulus values but different yield strengths. A comparison of the peak strains at 85 per cent of maximum elongation showed that overall the failure strain was inversely related to the crosshead displacement rate. Analysis of the mismatched coupons found that the failure location was a function of weld filler and was independent of strain rate. Higher magnification imaging of the weld nugget showed that strain partitioning occurred within the weld zone, with slightly lower strains in the cap pass as opposed to the root pass. © 2011 Author.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21271275
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Record identifier81a99006-a647-471f-97c3-fd2b6828639a
Record created2014-03-24
Record modified2016-05-09
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