Abstract
The objective of this paper is to investigate the influence of welding parameters on residual stress during circumferential welding of pipes. The 3D numerical simulation MSC-Marc code is used to predict the residual stress distribution developed during the welding. When two pipes are welded together, the residual stresses are generated in the vicinity of the weld, attributed to localized heating and subsequent cooling during the welding process. In order to obtain the optimum residual stress, suitable welding parameters are obtained. The influence of the design variables on the residual stress was evaluated using Taguchi method. These results indicate that the best result for welding residual stress can be obtained when the energy input, welding speed, welding sequence, and pipe diameter are 1.6 kW, 3.5 mm/s, sequence (a), and 60 mm, respectively. In general, the optimization parameters are usually chosen according to the specific conditions due to complex residual stress distribution.
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