AN EVALUATION OF EXPERIMENTAL METAL-CORED ELECTRODES FOR SUBMERGED-ARC WELDING OF HSLA100 STEEL

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Authors
  1. Gianetto, J.A.
  2. Smith, N.J.G.
  3. Dolan, D.E.
Corporate Authors
Metals Technology Labs, Ottawa ONT (CAN);Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
The object of this investigation was to develop and evaluate expeirmental electrode wires for joining HSLA100 steel with particular emphasis on improvement of weld metal toughness properties. The work focused on the development of metal-cored wires with varying C and Mo contents for submerged-arc (SA) welding. The series of SA welds produced with the metal-cored wires, in combination with a highly basic flux, provided better toughness than achieved using the reference 120S-1 electrode. Optimum toughness was achieved with the intermediate C and Mo contents. In general, the results were attributed to the influence of weld metal chemistry on the final weld microstructure, specifically the formation of a relatively fine bainitic structure with some lath martensite and limited grain boundary ferrite in both the as-deposited and reheated weld metal regions. For increasing weld metal C (0.040-0.090%) and Mo (0.45-0.70%) there was an increase in yield strength, hardness and tensile strength. With increasing C there was refinement of the microstructure, increased evidence of lath martensite, almost no grain boundary ferrite, and greater carbide precipitation. Changes in microstructure were much less pronouned with variation in Mo. In addition, increasing C was found to reduce the upper shelf energy, attributed to high weld metal yield strength and increase in carbide precipitation (enhanced microvoid coalescence).
Report Number
DREA-NAMT-93-3-PAP-11 — CONTAINED IN 99-00578
Date of publication
30 Apr 1993
Number of Pages
27
DSTKIM No
99-00589
CANDIS No
510316
Format(s):
Hardcopy;Document Image stored on Optical Disk

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