EVALUATION OF SENSITIZATION IN GAS TUNGSTEN ARC WELDED AISI 304 STAINLESS STEEL

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10.22099/ijstm.2014.1966

Abstract

In this study, the temperature distribution of an AISI 304 stainless steel during gas
tungsten arc welding is modeled by using the Goldak's three-dimensional moving heat source. A
C++ program is developed in order to employ the heat inputs into finite difference thermal
simulation of the welded plate. By simulating the temperature distribution and shape of the weld
pool, effect of welding parameters such as current and welding speed on the sensitization, weld
width and weld depth are evaluated. Results show that the width and depth of weld and sensitized
zone increase with raising the current while the sensitization location decreases. The effect of
welding speed is vice versa. To verify the simulated results, currents of 160, 200 and 240 A and
welding velocity of 2 mm/s are selected for experiments. Good agreement is obtained between the
simulated and experimental results.

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