Welding Metallurgy and Weldability.

Describes the weldability aspects of structural materials used in a wide variety of engineering structures, including steels, stainless steels, Ni-base alloys, and Al-base alloys Welding Metallurgy and Weldability describes weld failure mechanisms associated with either fabrication or service, and f...

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Bibliographic Details
Main Author:	Lippold, John C.
Format:	eBook
Language:	English
Published:	Wiley, 2014.
Subjects:	Stainless steel > Weldability. Stainless steel > Metallurgy. Nickel > Weldability. Nickel > Metallurgy. Nickel alloys > Weldability. Nickel alloys > Metallurgy. Nickel alloys > Metallurgy Nickel > Metallurgy Stainless steel > Metallurgy
Online Access:	Click for online access

Table of Contents:

Welding Metallurgy and Weldability
Copyright
Contents
Preface
Author Biography
Chapter 1 Introduction
1.1 Fabrication-Related Defects
1.2 Service-Related Defects
1.3 Defect Prevention and Control
References
Chapter 2 Welding Metallurgy Principles
2.1 Introduction
2.2 Regions of a Fusion Weld
2.3 Fusion Zone
2.3.1 Solidification of Metals
2.3.1.1 Solidification Parameters
2.3.1.2 Solidification Nucleation
2.3.1.3 Solidification Modes
2.3.1.4 Interface Stability
2.3.2 Macroscopic Aspects of Weld Solidification
2.3.2.1 Effect of Travel Speed and Temperature Gradient
2.3.3 Microscopic Aspects of Weld Solidification
2.3.3.1 Solidification Subgrain Boundaries (SSGB)
2.3.3.2 Solidification Grain Boundaries (SGB)
2.3.3.3 Migrated Grain Boundaries (MGB)
2.3.4 Solute Redistribution
2.3.4.1 Macroscopic Solidification
2.3.4.2 Microscopic Solidification
2.3.5 Examples of Fusion Zone Microstructures
2.3.6 Transition Zone (TZ)
2.4 Unmixed Zone (UMZ)
2.5 Partially Melted Zone (PMZ)
2.5.1 Penetration Mechanism
2.5.2 Segregation Mechanism
2.5.2.1 Gibbsian Segregation
2.5.2.2 Grain Boundary Sweeping
2.5.2.3 Pipeline Diffusion
2.5.2.4 Grain Boundary Wetting
2.5.3 Examples of PMZ formation
2.6 Heat Affected Zone (HAZ)
2.6.1 Recrystallization and Grain Growth
2.6.2 Allotropic Phase Transformations
2.6.3 Precipitation Reactions
2.6.4 Examples of HAZ Microstructure
2.7 Solid-State Welding
2.7.1 Friction Stir Welding
2.7.2 Diffusion Welding
2.7.3 Explosion Welding
2.7.4 Ultrasonic Welding
References
Chapter 3 Hot Cracking
3.1 Introduction
3.2 Weld Solidification Cracking
3.2.1 Theories of Weld Solidification Cracking
3.2.1.1 Shrinkage-Brittleness Theory
3.2.1.2 Strain Theory
3.2.1.3 Generalized Theory.
3.2.1.4 Modified Generalized Theory
3.2.1.5 Technological Strength Theory
3.2.1.6 Commentary on Solidification Cracking Theories
3.2.2 Predictions of Elemental Effects
3.2.3 The BTR and Solidification Cracking Temperature Range
3.2.4 Factors that Influence Weld Solidification Cracking
3.2.4.1 Composition Control
3.2.4.2 Grain Boundary Liquid Films
3.2.4.3 Effect of Restraint
3.2.5 Identifying Weld Solidification Cracking
3.2.6 Preventing Weld Solidification Cracking
3.3 Liquation Cracking
3.3.1 HAZ Liquation Cracking
3.3.2 Weld Metal Liquation Cracking
3.3.3 Variables that Influence Susceptibility to Liquation Cracking
3.3.3.1 Composition
3.3.3.2 Grain Size
3.3.3.3 Base Metal Heat Treatment
3.3.3.4 Weld Heat Input and Filler Metal Selection
3.3.4 Identifying HAZ and Weld Metal Liquation Cracks
3.3.5 Preventing Liquation Cracking
References
Chapter 4 Solid-State Cracking
4.1 Introduction
4.2 Ductility-Dip Cracking
4.2.1 Proposed Mechanisms
4.2.2 Summary of Factors That Influence DDC
4.2.3 Quantifying Ductility-Dip Cracking
4.2.4 Identifying Ductility-Dip Cracks
4.2.5 Preventing DDC
4.3 Reheat Cracking
4.3.1 Reheat Cracking in Low-Alloy Steels
4.3.2 Reheat Cracking in Stainless Steels
4.3.3 Underclad Cracking
4.3.4 Relaxation Cracking
4.3.5 Identifying Reheat Cracking
4.3.6 Quantifying Reheat Cracking Susceptibility
4.3.7 Preventing Reheat Cracking
4.4 Strain-Age Cracking
4.4.1 Mechanism for Strain-age Cracking
4.4.2 Factors That Influence SAC Susceptibility
4.4.2.1 Composition
4.4.2.2 Grain Size
4.4.2.3 Residual Stress and Restraint
4.4.2.4 Welding Procedure
4.4.2.5 Effect of PWHT
4.4.3 Quantifying Susceptibility to Strain-age Cracking
4.4.4 Identifying Strain-age Cracking
4.4.5 Preventing Strain-age Cracking.
4.5 Lamellar Cracking
4.5.1 Mechanism of Lamellar Cracking
4.5.2 Quantifying Lamellar Cracking
4.5.3 Identifying Lamellar Cracking
4.5.4 Preventing Lamellar Cracking
4.6 Copper Contamination Cracking
4.6.1 Mechanism for Copper Contamination Cracking
4.6.2 Quantifying Copper Contamination Cracking
4.6.3 Identifying Copper Contamination Cracking
4.6.4 Preventing Copper Contamination Cracking
References
Chapter 5 Hydrogen-Induced Cracking
5.1 Introduction
5.2 Hydrogen Embrittlement Theories
5.2.1 Planar Pressure Theory
5.2.2 Surface Adsorption Theory
5.2.3 Decohesion Theory
5.2.4 Hydrogen-Enhanced Localized Plasticity Theory
5.2.5 Beachem's Stress Intensity Model
5.3 Factors That Influence HIC
5.3.1 Hydrogen in Welds
5.3.2 Effect of Microstructure
5.3.3 Restraint
5.3.4 Temperature
5.4 Quantifying Susceptibility to HIC
5.4.1 Jominy End Quench Method
5.4.2 Controlled Thermal Severity Test
5.4.3 The Y-Groove (Tekken) Test
5.4.4 Gapped Bead-on-Plate Test
5.4.5 The Implant Test
5.4.6 Tensile Restraint Cracking Test
5.4.7 Augmented Strain Cracking Test
5.5 Identifying HIC
5.6 Preventing HIC
5.6.1 CE Method
5.6.2 AWS Method
References
Chapter 6 Corrosion
6.1 Introduction
6.2 Forms of Corrosion
6.2.1 General Corrosion
6.2.2 Galvanic Corrosion
6.2.3 Crevice Corrosion
6.2.4 Selective Leaching
6.2.5 Erosion Corrosion
6.2.6 Pitting
6.2.7 Intergranular Corrosion
6.2.7.1 Preventing Sensitization
6.2.7.2 Knifeline Attack
6.2.7.3 Low-Temperature Sensitization
6.2.8 Stress Corrosion Cracking
6.2.9 Microbiologically Induced Corrosion
6.3 Corrosion Testing
6.3.1 Atmospheric Corrosion Tests
6.3.2 Immersion Tests
6.3.3 Electrochemical Tests
References
Chapter 7 Fracture and Fatigue
7.1 Introduction.
7.2 Fracture
7.3 Quantifying Fracture Toughness
7.4 Fatigue
7.5 Quantifying Fatigue Behavior
7.6 Identifying Fatigue Cracking
7.6.1 Beach Marks
7.6.2 River Lines
7.6.3 Fatigue Striations
7.7 Avoiding Fatigue Failures
References
Chapter 8 Failure Analysis
8.1 Introduction
8.2 Fractography
8.2.1 History of Fractography
8.2.2 The SEM
8.2.3 Fracture Modes
8.2.4 Fractography of Weld Failures
8.2.4.1 Solidification Cracking
8.2.4.2 Liquation Cracking
8.2.4.3 Ductility-Dip Cracking
8.2.4.4 Reheat Cracking
8.2.4.5 Strain-Age Cracking
8.2.4.6 Hydrogen-Induced Cracking
8.3 An Engineer's Guide to Failure Analysis
8.3.1 Site Visit
8.3.2 Collect Background Information
8.3.3 Sample Removal and Testing Protocol
8.3.4 Sample Removal, Cleaning, and Storage
8.3.5 Chemical Analysis
8.3.6 Macroscopic Analysis
8.3.7 Selection of Samples for Microscopic Analysis
8.3.8 Selection of Analytical Techniques
8.3.9 Mechanical Testing
8.3.10 Simulative Testing
8.3.11 Nondestructive Evaluation Techniques
8.3.12 Structural Integrity Assessment
8.3.13 Consultation with Experts
8.3.14 Final Reporting
8.3.15 Expert Testimony in Support of Litigation
References
Chapter 9 Weldability Testing
9.1 Introduction
9.2 Types of Weldability Test Techniques
9.3 The Varestraint Test
9.3.1 Technique for Quantifying Weld Solidification Cracking
9.3.2 Technique for Quantifying HAZ Liquation Cracking
9.4 The Cast Pin Tear Test
9.5 The Hot Ductility Test
9.6 The Strain-to-Fracture Test
9.7 Reheat Cracking Test
9.8 Implant Test for HAZ Hydrogen-Induced Cracking
9.9 Gapped Bead-on-Plate Test for Weld Metal HIC
9.10 Other Weldability Tests
References
Appendix A Composition of Selected Steels
Appendix B Nominal Composition ofStainless Steels.
Appendix C Composition of Nickel-Base Alloys
Appendix D Etching Techniques
A4.1 Steels
A4.2 Stainless Steels
A4.3 Nickel-Base Alloys
A4.4 Fracture Surface Cleaning
References
Index
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Welding Metallurgy and Weldability.

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