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Evaluation of Dissimilar Finned Tube Weld (Gr.91 to Stainless Steel) made by High Frequency Resistance Welding Process
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One of the important areas to improve the effectiveness of power plant is by increasing heat conduction area using finned tube in heat recovery steam generators (HRSG) & fired heaters. The fin is considered to be a non-pressure bearing attachment with essentially no load-carrying function, joined to a pressure part by an automatic High Frequency Resistance Welding process with no addition of filler metal. The present work is aimed to study the principle of automatic high frequency resistance welding process and effect of welding parameters (welding current, welding voltage and welding speed) on final weld properties of (i) alloy steel tube (grade 91) to ferritic stainless-steel fin (S.S. 409) and (ii) alloy steel tube (grade 91) to austenitic stainless steel fin (S.S. 304). During experiment, mechanical testing such as pull out test, macro test, fusion width measurement, hardness and microstructure analysis was carried out to ensure good bonding & strength of the fin weld. Micro structure and EDS analysis was studied at tube-fin weld interface.
Keywords
Finned Tube, HFRW, Alloys Steel, Stainless Steel, Microstructure, Hardness, Pull Out Tensile, EDS.
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