Paper Title:
A Study on the Effect of Gap Width on Residual Stresses of Laser-Welded Dissimilar Joints
  Abstract

Laser-welded parts experience high local temperatures and severe heating-cooling cycles which lead to large local residual stresses. These stresses introduce unacceptable degradation of the mechanical properties of a weldment. Thermo-elasto plastic analyses with 3-D FE models, as well as experimental investigations were performed in order to predict temperature distribution and residual stresses of ND-YAG laser-welded joints with various gap widths between the dissimilar steel types of austenitic and precipitation-hardening stainless steel. The specimens have the shape of a pocket to optimize the weight of the structure, which consists of a thin skin (AISI304) and a thick skeleton (AISI630). The residual stresses at the surface of the weldments were measured using the instrumented indentation method. The residual stresses and melt-pool zone (MPZ) profiles show good agreement between the theoretical and experimental results. Considering the residual stresses, the allowable gap width range of the laser-welded joints for the pocket-shaped specimen was calculated. For a welding joint with gap widths, the longitudinal residual stress values at the yield stress level were observed. Melt-pool zone profiles described by the underfill and penetration depth also depend upon the gap size.

  Info
Periodical
Key Engineering Materials (Volumes 326-328)
Edited by
Soon-Bok Lee and Yun-Jae Kim
Pages
669-672
DOI
10.4028/www.scientific.net/KEM.326-328.669
Citation
H. S. Yang, B. C. Lee, "A Study on the Effect of Gap Width on Residual Stresses of Laser-Welded Dissimilar Joints", Key Engineering Materials, Vols. 326-328, pp. 669-672, 2006
Online since
December 2006
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Price
$32.00
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