Analysis of Welding Distortion for Laser Welded Sheet Metal Structures of Aluminum Alloy

Kwon, Ki-Bo; Kim, Jae-Woong; Kim, Cheol-Hee

Journal of KWJS 2009;27(3):44-51.
Published online July 6, 2009.

레이저용접에 의한 알루미늄 박판구조물의 용접변형 해석

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Analysis of Welding Distortion for Laser Welded Sheet Metal Structures of Aluminum Alloy

Ki-Bo Kwon, Jae-Woong Kim, Cheol-Hee Kim

Abstract

In this study, welding distortion analysis is performed for various design of tube shape structures which are assembled with aluminum sheet metal. Aluminum 5052 plates of 1mm thickness are used to analyze. An efficient keyhole model, as a welding heat source, is used for the prediction of full penetration weld size and shape which is required for the thermal analysis. The thermal and mechanical material properties are considered as temperature dependent functions, due to the high temperature variations during the welding. The numerical model is calculated by using a commercial software and evaluated with the experiments. The calculation results could make a comparative study in the view of distortion for the various size and shape of structure.

Key Words: Welding distortion, Finite element method(FEM), Aluminium alloy, Laser beam welding(LBW), Keyhole model