Toughness envelope definition of pulsed gas metal arc welds in HY80 steel

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Authors
  1. Bagg, D.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Fleet Technology Ltd, Kanata ONT (CAN)
Abstract
Over the past decade, Defence Research Establishment Atlantic (DREA) has sponsored several projects related to "All Position Gas Metal Arc Welding" as part of their mandate to develop expertis in submarine materials and maintenance technology. These efforts have led to the identification of pulsed GMAW with C5, C10, or T.I.M.E. gas combination as the preferred ones from the perspective of superior weld zone mechanical properties in HY steels. Previous work was successful in ranking new digital pulsed gas metal arc welding systems for optimal introduction in sumbarine refit followed by the development of a low heat input benchmark welding procedure for welding HY-80 steel in the vertical-up position, using Lincoln's LA100 (ER100S-1) solid wire with T.I.M.E. gas (26.5%He, 8%CO2, 0.5%02, and Argon bal.). Although the benchmark is considered a practical procedure for the purposes of submarine repair and modification it would be advantageous from the point of view of productivity to increase the heat input while maintaining the toughness requirements. Five welded panels were produced with ER 100S-1 solid wire and T.I.M.E. gas, and radiograhed +/- 20 degrees to normal to verify weld soundness. The heat input used to produce each welded panel spanned the practical range for all position welding with the objective of identifying a level at which the weld metal develop notch toughness transition curves for each weld heat input.

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Keywords
Heat input;100S-1
Report Number
DREA-CR-2001-085 — Contractor Report
Date of publication
01 Sep 2001
Number of Pages
29
DSTKIM No
CA020201
CANDIS No
516898
Format(s):
Hardcopy;Document Image stored on Optical Disk

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