Inconel 625 Butt Weld Fittings: Elbow, Reducer, Flange, Cap 1. Introduction Inconel 625 is a high-performance nickel-based alloy designed to perform in extreme environments. It is known for its excellent strength, corrosion resistance, and oxidation resistance in high-temperature conditions. As a result, Inconel 625 Butt Weld Fittings (elbows, reducers, flanges, caps) are used in a