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Abstract— In this paper, the effects of post weld heat treatment (PWHT) by ceramic pad heater to relieve residual stresses of an A106GRB carbon steel pipe is presented. At first, the pipe was welded in 3 passes by GTAW and SMAW process. The thermal cycle was measured during welding with k-type thermocouple. Hole drilling method has been used for measuring residual stresses before post weld heat treatment and after it to investigate on relieving residual stresses. Also, a 3D finite element analysis was used for predicting residual stresses before PWHT and after it for comparison with experimental data. The results show that the post weld heat treatment by ceramic pad heater can relief residual stresses up to 60% at HAZ and welding area.