Seven series of tensile plate specimens with a transverse T attachment, welded by either the shielded metal (SMAW) or flux cored (FCAW) process, were peened underwater and fatigue tested under pulsating tension. Each test series comprised eight specimens. Two of the series, one for each of the welding processes, were tested in the as-welded condition to provide reference performance. The underwater peening was carried out with a combination of tool types, bit sizes, and positions while the indentation was controlled with a goo-go depth gage. Prior to testing, the peened indentations were independently measured in air and depth statistics collected. A companion paper discusses various aspects of the quality control of peening underwater.
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