Essential testing in submarine pressure hull weld acceptance: Victoria class subs

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Authors
  1. Matthews, J.R.
  2. Porter, J.F.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
There is a growing interest in welding and weld approval issues for the Victoria Class submarines. It was accordingly requested by NDHQ DGMEPM that we provide a presentation at this conference on this subject. There are two main issues. The first is testing for weld approval. DREA recommends that Dynamic Tear transition testing and Explosion bulge testing be the primary special tests for approvals. The first addresses all impact issues and the latter addresses all explosive strain issues. The Australians and the Americans use these two tests but the British rely more on CTOD and crack starter bulge tests. The second issue is choice of weld process. For 18 years DREA has been able to meet the strength, impact and explosive strain requirements for submarine welds; first with conventional T.I.M.E. welding (1982), then with analog pulsed GMAW using TIME gas or C5 or C10 gas (1988) and more recently pulsed digital T.I.M.E. GMAW (1988) as well. The underlying technical issue is strength. The Australian, the British and the Americans lowered the strength of the weld to improve the impact performance. The Australian went to E10018 and m;anaged to find consumables that passed the tests (DT and explosion bulge). The British as it turned out lowered their strength from E11018 which they used on the first two Upholders to E9016 for the last two. TRUNCATED
Report Number
DREA-SR-2001-094-SES-II-PAP-9 — Special Report
Date of publication
01 Oct 2001
Number of Pages
11
DSTKIM No
CA011846
CANDIS No
516421
Format(s):
Hardcopy;Document Image stored on Optical Disk

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