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JWJ > Volume 28(3); 2010 > Article
Journal of KWJS 2010 June;28(3) :73-78.
Published online August 2, 2010.
A Study on the Distortion Control Characteristics of the STS 304 Multi-pass Butt Weldment by Tensioning Method
Ha-Geun Kim, Dong-Ju Lee, Sang-Beom Shin


Correspondence:   Published online August 2, 2010
ABSTRACT
  The purpose of this study is to develop the control technology of the welding distortion caused by Auto NG-GTA(Narrow Gap-GTA) welding process at the STS 304 multi-pass butt weldment. Heat input model for Auto NG-GTA welding process was established and verified by measuring temperature change and molten pool shape at the bead-on-plate weldment. With the heat input model developed, the effect of tension load on the welding distortion at the STS 304 multi-pass butt weldment was evaluated using the thermo-elasto-plastic FE analysis. In accordance with FEA results, the angular distortion and transverse shrinkage sharply decreased with an increase in tension load. This result indicated that tensioning method was an effective countermeasure against the welding distortion of the STS 304 multi-pass butt weldment.
Keywords: STS 304 Multi-pass butt weldment;Finite element analysis;Tension load;Tensioning method;Distortion control;Angular distortion;Transverse shrinkage
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