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Investigation of fracture in pressurized gas metal arc welded beryllium [electronic resource].

Published
Canoga Park, Calif : North American Aviation, inc. Atomics International Division, 1976.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators
North American Aviation. Atomics International Division and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Premature failures during proof testing of pressurized-gas-metal-arc (PGMA) welded beryllium assemblies were investigated. The failures were almost entirely within the beryllium (a forming grade, similar to HP-10 or S-240), close to and parallel to the weld interface. The aluminum-silicon weld filler metal deposit was not centered in the weld groove in the failed assemblies, and failure occurred on the side of the weld opposite the bias in the weld deposit. Tensile tests of welded samples demonstrated that the failures were unrelated to residual machining damage from cutting the weld groove, and indicated small lack-of-fusion areas near the weld start to be the most likely origin of the failures. Acoustic emission was monitored during tensile tests of the welds. The majority of acoustic emission was probably from crack propagation through the weld filler metal. Tensile bars cut from the region of the weld start behaved differently; they failed at lower loads and exhibited an acoustic emission behavior believed to be from cracking in the weld metal-beryllium interface. Improvement in the quality of these and similar beryllium welds can therefore most likely be made by centering the weld deposit and reducing the size of the weld start defect. 21 fig.
Report Numbers
E 1.99:rfp-2463
rfp-2463
Subject(s)
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Note
Published through SciTech Connect.
05/20/1976.
"rfp-2463"
Heiple, C.R.; Adams, R.O.; Merlini, R.J.
Funding Information
E(29-2)-3533
View MARC record | catkey: 14462557