The purpose of this study is to establish a proper groove design for multi-pass butt weldment with narrow groove of pressure vessel to control welding distortion. To do it, the behavior of angular distortion and longitudinal shrinkage force of the simple butt weldment were evaluated using a finite element analysis and experiment. The effective bending rigidity of the multi pass butt weldment with welding pass was defined as a function of the effective thickness of weld throat. Based on the results, the predictive equations for the welding distortion of the multi-pass both side weldment were established as function of heat input and effective bending/in-plane rigidity of the weldment. Using the equation, a proper ratio of the groove height can be determined to control the distortion for the multipass both side weldment with reference to various groove shape and plate thickness.

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