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Welded low-carbon steel bomb fins were rejected because of poor weld practice. Visual and metallographic examination revealed that the resistance plug welds that attach the outer skin to the inner spar displayed inadequate weld penetration. Recommended changes to the resistance welding parameters resulted in acceptable welds.

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M. Pepi, 2019. "Plug Weld Defects in Low-Carbon Steel Bomb Fins", ASM Failure Analysis Case Histories: Processing Errors and Defects

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