Toughness Envelope Definition of Pulsed Gas Metal Arc Welds in HY80 Steel
Abstract
Over the past decade, Defence Research Establishment Atlantic, has sponsored several projects related to "All Position Gas Metal Arc Welding" as part of their mandate to develop expertise 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 combinations 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 submarine refit followed by the development of a low heat input benchmark welding procedure for welding HY80 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% O2, Ar 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 ER100S-1 solid wire and T.I.M.E gas, and radiographed +/- 20 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 toughness drops off below the required value. Dynamic tear samples were extracted and tested to develop notch toughness transition curves for each weld heat input.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 07, 2001
- Accession Number
- AD1004998
Entities
People
- D. S. Begg
- J. R. Matthews