Abstract
Measurement of temperature during high-speed electron beam welding (EBW) is a difficult task as the local temperature changes much faster compared to the response of the thermocouple. Estimation of response lag of thermocouple and subsequent correction of the measured temperature is presented here for the first time for high energy, high speed electron beam welding. Temporal evolution of temperature at some selected locations of stainless steel samples were recorded using thermocouple during electron beam welding and subsequently the measured temperature were corrected to nullify the effect of response lag of the thermocouples. Two numerical predictions, one based on commercial finite element model, and the other based on an existing, indigenous, and well tested CFD (Computational Fluid Dynamics) model are used for validation of the measured temperature duly corrected against response lag of the thermocouple. A reasonable match was observed between corrected temperature and the calculated temperature data. Effect of energy input and welding speed on transient temperature evolution are also validated and reported.
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