The effect of electrochemical nickel coating (Watts bath) on the microstructure of super duplex stainless steels welded by the Nd:YAG pulsed laser process
Keywords:
Super austenitic stainless steels. Heat input. Cladding. GTAW. Corrosion resistance.Abstract
Super austenitic stainless steels possess high mechanical strength and corrosion resistance, making them widely used in the oil and gas industry. However, welding can cause microstructural changes, impacting their properties. This study evaluates the influence of heat input on the super austenitic stainless steel AISI 904L cladding over low-carbon steel ASTM A516 Grade 70 using the GTAW process. Macro and microstructural analyses, microhardness measurements, and corrosion tests were performed for two welding conditions. Results showed that heat input significantly affects the cladding properties, with reduced dilution and increased microhardness. Furthermore, the corrosion resistance of the cladding surpassed that of the substrate, approaching the properties of AISI 904L.
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