ASSESSMENT OF WELDING CONSUMABLES, SHIELDING GAS COMPOSITION, AND ENERGY INPUT FOR GAS-METAL-ARC WELDING OF HSLA 100 STEEL

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Authors
  1. Gianetto, J.A.
  2. Dolan, D.E.
  3. Braid, J.E.M.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN);Canada Centre for Mineral and Energy Technology, Ottawa ONT (CAN) Metals Technology Labs
Abstract
The objective of this study was to provide an assessment of welding consumables, shielding gas compositions and energy input for pulsed-gas- metal-arc (P-GMA) welding of HSLA100 steel. Three series of P-GMA welds were prepared using a solid reference elctrode and two newly developed metal-cored electrodes in combination with either a C5 (95% Ar + 5% CO2) or M2 (98% Ar + 2% O2) shielding gas. The welds were made using welding parameters to obtain nominal energy inputs of 1.5 and 3.0 kJ/mm. The results show that, although adequate yield strengths (marginal for the welds produced with the solid electrode) were achieved, the notch toughness obtained with the reference solid electrode MIL120S-1 was considerably higher than for corresponding welds produced with the metal-cored electrodes. In general, the acceptable strength and good notch toughness was associated with the formation of fine bainitic microstructures with relatively low O + S contents. The lower toughness obtained with the metal-cored electrodes resulted from highter O + S contents which reduced both the upper shelf energy and resistance to cleavage fracture.
Keywords
HSLA 100 STEEL;P-GMA
Report Number
DREP-CR-94-01;MTL-93-22 — Contractor's Report
Date of publication
01 Nov 1993
Number of Pages
40
DSTKIM No
94-02929
CANDIS No
141523
Format(s):
Hardcopy;Originator's fiche received by DSIS;Document Image stored on Optical Disk

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