Analytical Methodology Obtaining an Optimal Welding Sequence for Least Distortion
of Welded Structure

Ha, Yunsok

doi:2013.31.3.54

J Weld Join > Volume 31(3); 2013 > Article

Research Paper

Journal of KWJS 2013;31(3):54-59.
DOI: https://doi.org/10.5781/KWJS.2013.31.3.54 Published online June 30, 2013.

Analytical Methodology Obtaining an Optimal Welding Sequence for Least Distortion of Welded Structure

Yunsok Ha

Correspondence: Yunsok Ha,
Email: yunsok.ha@samsung.com

Abstract

Several methodologies analyzing welding distortions of large shell structures like ship blocks have been developed and utilized in shipyards for a long times ago. In general, one of objects of thermal distortion analysis is to find welding sequence making least-deformation without any suppliance, and it can be solved easily and rapidly by EP strain-boundary method. But after assembly construction, there are usually more than 10 weldments in each process, and the number of sequence will follow the Factorial calculation. In this research, a method has been suggested to decide the best welding sequence by minimum analysis. Using this method, welding deformation could be reduced just analyzing some cases as many as the number of weldments. Experiments and Analysis of all cases were also done, and their best results are good agreements with predictation by suggested methodology.

Key Words: Ship block, Wedling distortion, Shell element, FEM, Sequence