Further Testing of Toughness Envelope Welds

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Authors
  1. Begg, D.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);BMT Fleet Technology Limited, Kanada Ont (CAN)
Abstract
Over the past two decades, Defence R&D Canada has sponsored several projects related to “All Position Gas Metal Arc Welding (GMAW)” as part of their mandate to develop expertise in submarine materials and maintenance technology. These efforts have led to the identification of Gas Metal Arc Welding with T.I.M.E (Transfer Ionized Molten Energy) gas as the preferred process, from the perspective of providing a combination of optimal arc characteristics and superior weld zone mechanical properties in HY steels: first with T.I.M.E. welding and conventional power sources (1982), then with analog Pulsed Gas Metal Arc Welding (P-GMAW) (1988), and more recently with microprocessor based digital P-GMAW (1998). During the same period Defence R&D Canada has isolated Dynamic Tear Fracture Transition Testing and Explosion Bulge Testing as the primary special tests for weld process and consumable approvals. The first addresses all impact rate issues and the latter addresses all explosive rate issues. This work has yielded a connection between the fracture transition results and quantitative fracture mechanics parameters. Recent work has been successful in ranking new digital P-GMAW equipment for optimal introduction in submarine refit. Most recently, the focus has been on heat input, in which five welded panels were produced with MIL100S-1 solid wire and T.I.M.E gas. TRUNCATED

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Keywords
Fracture transition;Dynamic tear;Transition testing;P-GMAW;T.I.M.E.
Report Number
DRDC-ATLANTIC-CR-2002-124 — Contractor Report
Date of publication
01 Oct 2002
Number of Pages
42
DSTKIM No
CA022409
CANDIS No
519309
Format(s):
CD ROM

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