To Develop a Weld Temperature Measuring System

Temperature distribution during any welding process holds the key for understanding and predicting several important welding attributes like heat affected zone, microstructure of the weld, residual stress, and distortion during welding. The metal-inert gas welding temperature in the heat affected zone was measured with the help of k-type thermocouple wire. The thermocouples junctions were made with the help of a soft arc of carbon arc welding. These junctions (hot junctions) were then embedded into the workpiece through brazing at progressively increasing distance from the weld line so as to record the variation of temperature with respect to distance from weld center line. The thermocouple wire was connected to a circuit at the Sunrom thermocouple amplifier. The temperature was measured on Arduino serial plotter. The temperature found during MIG welding were in good agreement with the expected temperature at the specified distance for a particular set of conditions.