Nickel-Aluminum bronze (NAB) (UNS 63000) main propulsion shafts are employed in AVENGER Class minesweepers due to the alloy’s strength, corrosion resistance, and low ferromagnetic signature. The US Navy sought additional sources of sustaining the Fleet with refurbished shafts using weld repair processes followed by Post-weld Temper Annealing (PWTA) heat treatment to mitigate dealloying corrosion. This paper describes the high level of technical cooperation and information sharing among Navy, shaft repair facility, and supplier metallurgists and engineers needed to successfully develop, test, and qualify three essential weld repair processes and supporting inspection and PWTA procedures for NAB shafts.

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