Modeling of transport phenomena and thermal stress in spot laser keyhole welding

Jun Zhou, Amir Khalilollahli, Hai Lung Tsai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Due to the highly-localized heating and non-uniform cooling in spot laser keyhole welding, complex residual stresses are often found in final welds, which can cause detrimental effects on mechanical properties of the welds and result in problems like cracking and distortion. Since the formation of thermal stress is tightly related with the heating, melting, solidification, and cooling processes in welding, accurate analysis of the transient thermal transport phenomenon in welding is critical to predict the thermal stress information in final welds. In this study, a comprehensive thermal model analyzing the heating, melting, solidification, cooling processes in spot laser keyhole welding is integrated with a mechanical model to accurately predict the thermal stress evolutions in laser welding and the resultant residual stresses in final welds as well. High compressive residual stress was found on the top surface of the workpiece in welding which causes rough surface (bumps) of the final weld. Residual tensile stress in some locations in the final weld was found to be higher than the critical level which indicates the potential thermal cracking occurrence. The proposed models can be used to further study the thermal stress formation mechanisms in laser welding and to provide a cost-efficient way to optimize the welding operations.

Original languageEnglish (US)
Title of host publication39th North American Manufacturing Research Conference 2011 - Transactions of the North American Manufacturing Research Institution of SME
Pages546-552
Number of pages7
StatePublished - 2011
Event39th Annual North American Manufacturing Research Conference, NAMRC39 - Corvallis, OR, United States
Duration: Jun 13 2011Jun 17 2011

Publication series

NameTransactions of the North American Manufacturing Research Institution of SME
Volume39
ISSN (Print)1047-3025

Other

Other39th Annual North American Manufacturing Research Conference, NAMRC39
CountryUnited States
CityCorvallis, OR
Period6/13/116/17/11

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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