THE INFLUENCE OF WELD STRENGTH MISMATCH ON THE FITNESS-FOR-SERVICE ASSESSMENT OF WELDED STEEL STRUCTURES

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Authors
  1. Kirk, M.T.
Corporate Authors
Edison Welding Inst, Columbus OH (US);Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Finite-element analyses of M(T) speciemsn are conducted to investigate systematically the effects of crack length (a/W = 0.025 and 0.05), weld gap width (h/a = 0.5 to 15), mismatch level (20% undermatched to 75% overmatched), and work hardening capacity (n = 4 to 18) on Option 3 FADs constructed by the guidelines of Central Electricity Generating Board Document R6, Revision 3. These analyses demonstrate that adopting a homogeneous approximation of the lower strength material, all base metal for overmatched welds or all weld metal for undermatched welds, will always produce a conservative FAD for the assessment of welded structures. Further, the best approximation of a FAD for both undermatched and overmatched weldments using a homogeneous analysis is achieved when cracks that are long compared to the weld gap width are approximated as existing entirely in base metal while cracks that are short compared to the weld gap width are approximated as existing entirely in weld metal. Guidance is provided regarding the ratio of weld gap width to crack length at which these two homogeneous approximations become equally inaccurate. The maximum inaccuracy incurred using both homogeneous approximation is 6% for + or - 20% mismatched weldments and 19% for 75% overmatched weldments.
Report Number
DREA-NAMT-93-4-PAP-14A — CONTAINED IN 99-00578
Date of publication
30 Apr 1993
Number of Pages
18
DSTKIM No
99-00593
CANDIS No
510783
Format(s):
Hardcopy;Document Image stored on Optical Disk

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