A Study on Welding Distortion of GTA Circular Type Lap Joint in STS304L Thin Plate

Kim, Il-Ho; Kim, Ha-Geun; Shin, Sang-Beom; Park, Dong-Hwan

doi:2012.30.5.57

J Weld Join > Volume 30(5); 2012 > Article

Journal of KWJS 2012;30(5):57-63.
DOI: https://doi.org/10.5781/KWJS.2012.30.5.57 Published online November 30, 2012.

STS304L 박판 원형 겹치기 GTA 용접부의 용접 변형 예측에 관한 연구

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A Study on Welding Distortion of GTA Circular Type Lap Joint in STS304L Thin Plate

Il-Ho Kim, Ha-Geun Kim, Sang-Beom Shin, Dong-Hwan Park

Abstract

  The purpose of this study is to evaluate the welding distortion of the circular type lap joint in STS304L of 0.7㎜ thickness by using FEA. In order to do it, a heat input model for GTA welding process with non-consumable electrode was established through comparing the molten pool shapes and temperature distributions obtained by both FEA and experiment. With the heat input model, the welding distortion of the circular type lap joint was evaluated by 3-D FEA. From FEA results, it was found that 3-D FEA with proper heat input model can be used for the evaluation of the excessive distortion of the circular type lap joint of STS304L thin plate. In addition, the root cause of the excessive distortion in the weld was also identified as the excessive compressive residual stress in the tangential direction of the weld.

Key Words: STS 304L, Lap Joint, GTA, Heat input model, Welding, Distortion, Residual stress, Finite element analysis