Energy Analysis in TIG Welding Process

Abstract

Abstract An analysis of energy utilization during TIG welding process has been reported in this paper. Fifteen samples of three different diameters of pipe pieces of ASTM A 106 Gr. B, seamless type and API 5LS Gr. B, spirally welded type, are selected for experimentation. The temperatures on the external surface at different locations on each of these seamless pipes (of different diameters) during welding have been measured with the help of electronic pyrometers. The amount of total electrical energy input during welding has been recorded in the wattmeter. The convection and radiation energy losses, that take place from the surface of the pipe piece, have also been determined by using suitable mathematical expressions developed for the purpose. An overall energy balance is carried out taking into account the convection heat loss, the radiation heat loss and the unaccounted loss, for each sample. Then the variation of the ratio of the percentage of unaccounted energy loss to total weld energy input against total weld energy input has been plotted. From the graphs it is seen that with increase in diameter of the pipe and with rise in total weld energy input, the percentage unaccounted energy loss gradually decreases.