Civil Engineering Association

Minimization of welding distortion and buckling: Modelling and implementation >> Edited by P Michaleris, Penn State University, USA

- provides a systematic overview of the methods of minimizing distortion and buckling in welded structures
- focuses on understanding welding stress and distortion featuring computational welding mechanics and modelling the effect of phase transformations
- explores different methods of minimizing welding distortion discussing differential heating and dynamic thermal tensioning

Welding is a cost-effective and flexible method of fabricating large structures, but drawbacks such as residual stress, distortion and buckling must be overcome in order to optimize structural performance. Minimization of welding distortion and buckling provides a systematic overview of the methods of minimizing distortion and buckling in welded structures.

Following an introductory chapter, part one focuses on understanding welding stress and distortion, with chapters on such topics as computational welding mechanics, modelling the effect of phase transformations on welding stress and distortion and using computationally efficient reduced-solution methods to understand welding distortion. Part two covers different methods of minimizing welding distortion. Chapters discuss methods such as differential heating for minimizing distortion in welded stiffeners, dynamic thermal tensioning, reverse-side heating and ways of minimizing buckling such as weld cooling and hybrid laser arc welding.

With its distinguished editor and international team of contributors, Minimization of welding distortion and buckling is an essential reference for all welders and engineers involved in fabrication of metal end-products, as well as those in industry and academia with a research interest in the area.

Contents

PART 1 UNDERSTANDING WELDING RESIDUAL STRESS AND DISTORTION
PART 2 MINIMIZING WELDING DISTORTION

PART 1 UNDERSTANDING WELDING RESIDUAL STRESS AND DISTORTION

Introduction to welding residual stress and distortion
P Michaleris, Penn State University, USA
- Types of welding distortion
- Formation of welding distortion
- Distortion control methods
- Book outline
- References

Understanding welding stress and distortion using computational welding mechanics
L-E Lindgren, Luleå University of Technology, Sweden
- Introduction
- The Satoh test
- Thermo-mechanical analysis of welding problems
- Eularian and Lagrangian reference frames
- Nonlinear heat conduction
- Nonlinear deformation
- Finite element techniques in computational welding mechanics (CWM)
- Heat input models
- Material models
- References

Modelling the effects of phase transformations on welding stress and distortion
J A Francis and P J Withers, University of Manchester, UK
- Introduction
- Types of transformation
- Transformation strains
- Equilibrium phase diagrams
- Continuous cooling transformation (CCT) diagrams
- Significance of transformation temperature
- Metallurgical zones in welded joints
- Effects of phase transformations on residual stresses in welds
- Transformation plasticity
- Current status of weld modelling
- References

Modelling welding stress and distortion in large structures
L Zhang, Link-Belt Construction Equipment, USA
- Introduction
- 3D applied plastic strain methods
- Application on a large structure
- Conclusions
- References

Using computationally-efficient, reduced-solution methods to understand welding distortion
T G F Gray, University of Strathclyde, UK and D Camilleri, University of Malta, Malta
- Introduction
- Context and rationale for reduced solution methods
- Computationally-efficient solutions based on mismatched thermal strain (MTS) and transverse contraction strain (TCS) algorithms
- Verification of MTS and TCS algorithms
- Multiple welds
- Fillet welds
- Hybrid and stepwise strategies
- Selected case studies
- Future trends
- Sources of further information and advice
- References

PART 2 MINIMIZING WELDING DISTORTION

Minimization of bowing distortion in welded stiffeners using differential heating
M V Deo, Cummins Inc., USA
- Introduction
- Welding induced residual stress and bowing distortion
- Mitigation of welding induced bowing distortion
- Experimental verification of transient differential heating
- Results
- Conclusions
- References

Dynamic thermal tensioning for controlling welding induced distortion
W Li, The University of Texas at Austin and J Xu, Strategic Global Sourcing, USA
- Introduction
- A simplified finite element model
- The dynamic thermal tensioning method
- Mitigating buckling distortion using the dynamic thermal tensioning method
- Conclusions
- References

Minimizing buckling distortion in welding by weld cooling
J Li, Beijing Aeronautical Manufacturing Technology Research Institute and Q-Y Shi, Tsinghua University, P. R. China
- Introduction
- Welding with intensive trailing cooling, the dynamically controlled low stress no distortion
- (DC-LSND) method and its influence on welded joint (structure)
- Mechanism of DC-LSND method
- Restriction and industry application
- Conclusions
- References

Minimizing buckling distortion in welding by hybrid laser arc welding
S M Kelly, R P Martukanitz and E W Reutzel, Pennsylvania State University, USA
- Laser beam welding
- Hybrid laser arc welding (HLAW)
- Hybrid laser arc welding for reducing distortion in marine construction
- Conclusions
- References

Minimizing angular distortion in welding by reverse-side heating
M Mochizuki, Osaka University, Japan
- Introduction
- Experimental
- Mechanism of reduction in welding distortion
- Conclusions
- Acknowledgements
- References