Development of All-Position Coated Welding Electrode of Chromium-Enriched Cupronickel Alloy.
ARCOS CORP PHILADELPHIA PA
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A three-phase program for the development of a satisfactory all-position chromium-enriched cupronickel electrode was proposed by Arcos Corporation and accepted by the government. In Phase I experimental electrodes were produced and screened for welding operation by use of horizontal and vertical fillets. The electrodes deemed most promising in the operational tests were then checked initially for weld metal soundness via test 8a, the vertical plate of specification MIL-E-222004B and Arcos modified test 8a, a simulated pipe test. In Phase II, the best electrodes from Phase I testing were evaluated for conformance to tentative mechanical properties and weld metal composition, and weld metal soundness in the flat position by use of test 3 of specification MIL-E-222004B. In Phase III, pipe welds were made in 4 in. NPS class 700 chromium-enriched cupronickel pipe with electrodes culled by use of Phase I and II tests. The procedure used was test 9 of specificiation MIL-E-222004A interim amendment 3. A total of 50 formulas were made and evaluated. A successful electrode with excellent operational characteristics was developed and a demonstration was made before an NSRD representative. Recommendations for further work were presented. Author
- Metallurgy and Metallography