Abstract
Abstract Two bent pipe sections of the fuel oil system of a heavy-duty gas turbine engine had to be disassembled due to leakage. One of the two specimens received by the laboratory of the engine manufacturer featured a sub-standard weld repair performed by customer personnel. A metallurgical failure investigation was ordered to determine the root cause of the leakage and to verify the results of a laboratory investigation already performed by a third party at the customer's request. The repair-welded bent pipe section failed due to halide-induced pitting corrosion that propagated through-wall in a transgranular stress corrosion cracking (SCC) mode.
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