Evaluation of Commercially Available Wet Welding Electrodes for Potential Repair of U.S. Navy Ships
NAVAL SEA SYSTEMS COMMAND WASHINGTON DC
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As part of a program to determine the viability of underwater wet welding for repair of U. S. Navy surface ships, eight commercially available shielded metal arc wet welding electrodes were evaluated by a series of screening tests. Two E7014 type electrodes provided superior results and were used for welding procedure qualification testing on ASTM A-36 steel with a carbon equivalent of 0.35. Qualification testing included visual, liquid penetrant and radiographic inspection, as well as bend testing, reduced section tensile testing, all-weld-metal tensile testing, Charpy impact testing, macroscopic examination, hardness testing, and chemical analyses. The wet welding was performed in the vertical, overhead and horizontal positions. The welding took place at seven and thirty-three feet of sea water. Nondestructive and destructive test results show that both electrodes exceed the requirements of American Welding Society specification for underwater welding, AWS D3.6 Ref. 2 Type B. Weld quality and strength were found to be approximately on a par with welds made in an air environment. Weldment ductility and toughness were appreciably lower than would be expected of air welds.
- Electrical and Electronic Equipment
- Fabrication Metallurgy
- Couplers, Fasteners and Joints
- Marine Engineering