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 failure mechanisms related to microstructure of the weldment. Weldability issues are divided into fabrication and service related failures; early chapters address hot cracking, warm (solid-state) cracking, and cold cracking that occur during initial fabrication, or repair. Guidance on failure analysis is also provided, along with examples of SEM fractography that will aid in determining failure mechanisms. Welding Metallurgy and Weldability examines a number of weldability testing techniques that can be used to quantify susceptibility to various forms of weld cracking. Describes the mechanisms of weldability along with methods to improve weldability Includes an introduction to weldability testing and techniques, including strain-to-fracture and Varestraint tests Chapters are illustrated with practical examples based on 30 plus years of experience in the field Illustrating the weldability aspects of structural materials used in a wide variety of engineering structures, Welding Metallurgy and Weldability provides engineers and students with the information needed to understand the basic concepts of welding metallurgy and to interpret the failures in welded components.John C. Lippold received his BS, MS, and PhD degrees in Materials Engineering from the Rensselaer Polytechnic Institute. Upon completion of his formal education, Dr. Lippold worked for seven years at Sandia National Laboratories as a member of the technical staff, specializing in stainless steel and high alloy weldability. From 1985 to 1995, Dr. Lippold worked for Edison Welding.

Institute. From 1995 to the present, he has been on the faculty of the Welding Engineering program at The Ohio State University and was recently named a College of Engineering Distinguished Faculty member.

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 Sweep…