STUDY OF UNDERMATCHED WELDS IN HSLA 100 STEEL

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Authors
  1. Yee, R.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Fleet Technology Ltd, Kanata ONT (CAN)
Abstract
Tensile and fracture toughness tests have been used to determine whether undermatched welds have lower joint efficiency and higher crack driving force because of increased strain concentration near weld metal flaws. Mismatched welds were fabricated by overaging 15 mm HSLA100 steel plate to four reduced yield strengths, and then using the same shielded-metal-arc welding consumable and procedure to make five welds with different degrees of under- and overmatch between -30% and +16% of yield strength (-22% to +18% of UTS), but having the same weld metal toughness. The 75 mm wide cross weld tensile specimens were tested with and without reinforcement, and the full thickness fracture toughness tests were performed at various sub-zero temperatures using nominal aW ratios of 0.17 and 0.5. The tensile tests indicated that in the absence of weld reinforcement the tolerable level of ultimate strength undermatch for fracture outside the weld metal is about 7%. In the presence of reinforcement, the tolerable level of undermatch increases to about 15%. For the fracture toughness tests, two different sets of equations were used to calculate the crack driving force. The first uses the standard J and CTOD formulations used in ASTM and BSI standards. TRUNCATED
Keywords
HSLA steel;Low alloy steels;HSLA-100 Steel
Report Number
DREA-CR-98-414 — Contractor Report
Date of publication
01 Jan 1998
Number of Pages
147
DSTKIM No
98-01438
CANDIS No
508280
Format(s):
Hardcopy;Document Image stored on Optical Disk

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