Control of Welding Distortion in Thin-Plate Fabrication

Informationen zum Autor Tom Gray is a Professor at the University of Strathclyde, UK. Duncan Camilleri is a Senior Lecturer at the University of Malta, Malta. Norman McPherson is a Welding Manager at BAE Systems, Surface Ships, UK. Klappentext The uneven process of heating and cooling during welding can introduce distortions into metal components which create residual stresses. Welding distortion is a particular problem in fabricating thin plate structures such as ships. Based on pioneering research by the authors, this book reviews ways of modelling and testing welding distortion and how this understanding can be used to develop design and manufacturing strategies to reduce welding distortion and its effects. Inhaltsverzeichnis Author contact details Woodhead Publishing Series in Welding and Other Joining Technologies Preface 1. Introduction: development of computational welding mechanics approach to welding distortion Abstract: 1.1 Background: control of welding distortion in fabrication practice 1.2 Aims: integrated design approach utilising computational welding mechanics (CWM) 1.3 Structure of the book 1.4 Conclusion 1.5 References 2. Fabrication of stiffened thin-plate structures and the problem of welding distortion Abstract: 2.1 Introduction 2.2 Welding distortion of stiffened-plate and other fabricated structures 2.3 Outline of a typical fabrication process 2.4 Raw materials and primary process factors 2.5 Management issues relevant to thin-plate distortion 2.6 Rectification of thin-plate distortion 2.7 Conclusion 2.8 References 3. Tools to deal with welding distortion: predictive modelling and research on in-process techniques Abstract: 3.1 Introduction 3.2 Artificial neural networks (ANNs) 3.3 Computational simulation 3.4 Current research on reduction of distortion 3.5 Conclusion 3.6 References 4. Understanding welding distortion: thermal fields thermo-mechanical effects Abstract: 4.1 Introduction 4.2 Thermal fields: dependence on welding parameters and material properties 4.3 Thermo-mechanical effects 4.4 Thermo-mechanical treatment based on longitudinal-transverse uncoupling 4.5 Plane strain strip: longitudinal deformations and forces 4.6 Transverse welding deformations 4.7 Residual stress 4.8 Buckling 4.9 Conclusion 4.10 References 5. Computational simulation of welding distortion: an overview Abstract: 5.1 Introduction 5.2 Multi-physics 5.3 Thermal property non-linearity 5.4 Phase change and non-linear thermal dilatation 5.5 Mechanical property idealisation 5.6 Thermal computation outline 5.7 Range of thermo-mechanical approaches available 5.8 Reduced solutions and their advantages 5.9 Conclusion 5.10 References 6. Experimental investigation of models of welding distortion: methods, results and comparisons Abstract: 6.1 Introduction 6.2 Importance of experimental observations 6.3 Welding process application in test work 6.4 Thermocouple arrays 6.5 Thermography 6.6 Deformation measurement 6.7 Completion and smoothing of measured deformation profiles 6.8 Characterising out-of-plane deformation 6.9 Conclusion 6.10 References 7. Modelling thermal processes in welding Abstract: 7.1 Introduction 7.2 Convection and radiation 7.3 Heat input modelling 7.4 Simulation of weld deposition 7.5 Thermal property non-linearity 7.6 Three-dimensional transient thermal computation 7.7 Transient finite-element model based on two-dimensional cross-section 7.8 Thermal computa...

Autorentext
Tom Gray is a Professor at the University of Strathclyde, UK. Duncan Camilleri is a Senior Lecturer at the University of Malta, Malta.Norman McPherson is a Welding Manager at BAE Systems, Surface Ships, UK.

Klappentext
The uneven process of heating and cooling during welding can introduce distortions into metal components which create residual stresses. Welding distortion is a particular problem in fabricating thin plate structures such as ships. Based on pioneering research by the authors, this book reviews ways of modelling and testing welding distortion and how this understanding can be used to develop design and manufacturing strategies to reduce welding distortion and its effects.

Inhalt

Author contact details

Woodhead Publishing Series in Welding and Other Joining Technologies

Preface

1. Introduction: development of computational welding mechanics approach to welding distortion

   Abstract:

   1.1 Background: control of welding distortion in fabrication practice

   1.2 Aims: integrated design approach utilising computational welding mechanics (CWM)

   1.3 Structure of the book

   1.4 Conclusion

   1.5 References

2. Fabrication of stiffened thin-plate structures and the problem of welding distortion

   Abstract:

   2.1 Introduction

   2.2 Welding distortion of stiffened-plate and other fabricated structures

   2.3 Outline of a typical fabrication process

   2.4 Raw materials and primary process factors

   2.5 Management issues relevant to thin-plate distortion

   2.6 Rectification of thin-plate distortion

   2.7 Conclusion

   2.8 References

3. Tools to deal with welding distortion: predictive modelling and research on in-process techniques

   Abstract:

   3.1 Introduction

   3.2 Artificial neural networks (ANNs)

   3.3 Computational simulation

   3.4 Current research on reduction of distortion

   3.5 Conclusion

   3.6 References

4. Understanding welding distortion: thermal fields thermo-mechanical effects

   Abstract:

   4.1 Introduction

   4.2 Thermal fields: dependence on welding parameters and material properties

   4.3 Thermo-mechanical effects

   4.4 Thermo-mechanical treatment based on longitudinal-transverse uncoupling

   4.5 Plane strain strip: longitudinal deformations and forces

   4.6 Transverse welding deformations

   4.7 Residual stress

   4.8 Buckling

   4.9 Conclusion

   4.10 References

5. Computational simulation of welding distortion: an overview

   Abstract:

   5.1 Introduction

   5.2 Multi-physics

   5.3 Thermal property non-linearity

   5.4 Phase change and non-linear thermal dilatation

   5.5 Mechanical property idealisation

   5.6 Thermal computation outline

   5.7 Range of thermo-mechanical approaches available

   5.8 Reduced solutions and their advantages

   5.9 Conclusion

   5.10 References

6. Experimental investigation of models of welding distortion: methods, results and comparisons

   Abstract:

   6.1 Introduction

   6.2 Importance of experimental observations

   6.3 Welding process application in test work

   6.4 Thermocouple arrays

   6.5 Thermography

   6.6 Deformation measurement

   6.7 Completion and smoothing of measured deformation profiles

   6.8 Characterising out-of-plane deformation

   6.9 Conclusion

   6.10 References

7. Modelling thermal processes in welding

   Abstract:

   7.1 Introduction

   7.2 Convection and radiation

   7.3 Heat input modelling

   7.4 Simulation of weld deposition

   7.5 Thermal property non-linearity

   7.6 Three-dimensional transient thermal computation

   7.7 Transient finite-element model based on two-dimensional cross-section

   7.8 Thermal computation in stiffener fillet weld geometries

   7.9 Welding efficiency

   7.10 Thermal cutting

   7.11 Conclusion

   7.12 References

8. Computationally efficient methods for modelling welding processes

   Abstract:

   8.1 Introduction

   8.2 Computationally efficient methods based on algorithms

   8.3 Hybrid stepwise solution methods

   8.4 Conclusion

   8.5 References

9. Finite-element thermo-mechanical techniques for welding distortion prediction

   Abstract:

   9.1 Introduction

   9.2 Formulation of thermo-mechanical finite-element model

   9.3 Case study: influence of tacking procedures on butt-weld distortion

   9.4 Case study: fillet-welded stiffened plate

   9.5 Conclusion

   9.6 References

10. Simulating welding distortion in butt welding of thin plates

    Abstract:

    10.1 Introduction

    10.2 Plate support and out-of-flatness influences

    10.3 Effects of tacking

    10.4 Clamping effects

    10.5 Residual stress in butt welds

    10.6 Multiple butt welds

    10.7 Conclusion…