EFFECT OF UNDERMATCHING WELD METAL ON THE MEASURED FRACTURES TOUGHNESS OF HSLA 100 JOINTS

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Authors
  1. Yee, R.
  2. Malik, L.
  3. Morrison, J.
Corporate Authors
Fleet Technology Ltd, Kanata ONT (CAN);Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Modern high strength steels such as HSLA 100 have excellent toughness and resistance to cold cracking in the heat affected zone, even when they are welded without pre-heat. Unfortunately, welding consumables with comparable strength, toughness and resistance to cold cracking are not yet commercially available. As a result, fabricators are unable to fully exploit the cost advantages of welding such steels at this time. A potential solution to this problem is to weld the steels with undermatching consumables that have a lower tensile strength but higher intrinsic fracture toughness than the base metal. It is assumed that the higher intrinsic fracture toughness of the undermatching weld metal is sufficient to counter the higher crack driving force resulting from strain concentrations in the undermatching weld metal. Although the effect of undermatching weld metal on measured fracture toughness has been inferred from numerical studies of the crack driving force in undermatching weld metal, there has been little experimental investigation of this effect. In the present study, HSLA steel plate was heat-treated to four lower yield strengths. Butt joints were subsequently made from these four steels as well as steel in the as-received condition. These joints were subsequently made from these four steels as well as steel in the as-received condition. TRUNCATED
Report Number
DREA-NAMT-95-4-PAP-5 — CONTAINED IN 99-00779
Date of publication
30 May 1995
Number of Pages
30
DSTKIM No
99-00799
CANDIS No
510363
Format(s):
Hardcopy;Document Image stored on Optical Disk

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