Determination Of Weld Integrity Through Nondestructive Testing Methods

This second edition builds on the success of the first and covers the widespread introduction of computer technology, particularly the digitisation of data into the many branches of NDT. It surveys the new European (CEN) Standards and provisional CEN Standards on NDT, many of which are replacing British Standards. New NDT techniques not included in the first edition are also included.

This book emphasizes the need for non-destructive testing and evaluation of welded components, with due coverage of various aspects of welding technology. It covers in detail different types of welding processes, weld defects, fitness for purpose approach, quality classes and the choice of NDT techniques including all major conventional and advanced NDT techniques. Wide coverage has been given for residual stress analysis in weldments, automation and robotics in NDT and weld related failures. Intelligent welding, fracture mechanics concepts, quality control including total quality management and codes and standards add to the unique value of the book. The whole text is structured in such a way that a lot of emphasis has been given to basic principles, applications of each technique pertaining to weld inspection and related case studies. This book will fulfill the need for professionals with overlapping interest in both welding technology and NDT.Contents: Introduction to Welding Techniques, Defects, and Types of Tests; Visual Inspection; Liquid-Penetrant, Magnetic-Particle, Eddy-Current, Acoustic-Emission Testing, Ultrasonic and Leak Testing; Radiography; Thermography In-Situ Metallography; Residual-Stress Analysis in Weldments; Automation and Robotics in NDT; Computers in Weld Inspection; Intelligent Welding; Fracture-Mechanics Concepts; Weld-Related Failures; Quality Control in Production Welding; Welding Codes and Standards.

Acquaints readers with the common nondestructive inspection (NDT) methods available, and aids in selecting the method best suited for inspection of a given weld." -- Abstract.

Nondestructive testing (NDT) is the process of inspecting, testing, or evaluating materials, components or assemblies for discontinuities, or differences in characteristics without destroying the serviceability of the part or system. In other words, when the inspection or test is completed the part can still be used. In contrast to NDT, other tests are destructive in nature and are therefore done on a limited number of samples ("lot sampling"), rather than on the materials, components or assemblies actually being put into service. These destructive tests are often used to determine the physical properties of materials such as impact resistance, ductility, yield and ultimate tensile strength, fracture toughness and fatigue strength, but discontinuities and differences in material characteristics are more effectively found by NDT. Today modern nondestructive tests are used in manufacturing, fabrication and in-service inspections to ensure product integrity and reliability, to control manufacturing processes, lower production costs and to maintain a uniform quality level. During construction, NDT is used to ensure the quality of materials and joining processes during the fabrication and erection phases, and in-service NDT inspections are used to ensure that the products in use continue to have the integrity necessary to ensure their usefulness and the safety of the public. It should be noted that while the medical field uses many of the same processes, the term "nondestructive testing" is generally not used to describe medical applications. Test method names often refer to the type of penetrating medium or the equipment used to perform that test. Current NDT methods are: Acoustic Emission Testing (AE), Electromagnetic Testing (ET), Laser Testing Methods (LM), Leak Testing (LT), Magnetic Flux Leakage (MFL), Liquid Penetrant Testing (PT), Magnetic Particle Testing (MT), Neutron Radiographic Testing (NR), Radiographic Testing (RT), Thermal/Infrared Testing (IR), Ultrasonic Testing (UT), Vibration Analysis (VA) and Visual Testing (VT). The six most frequently used test methods are MT, PT, RT, UT, ET and VT. Each of these test methods will be described here, followed by the other, less often used test methods.

Revision of Document IIS/IIW - 1033-89 'Information on practices for underwater non-destructive testing' Prepared by Working Group 2 of Commission V - Quality Control and Quality Assurance of Welded Products

Key articles from over 10 separate ASM publications are brought together as a practical reference on weld integrity crack prevention. This book thoroughly covers the essentials of weld solidification and cracking, weldability and material selection, process control and heat treatment, failure analysis, and fatigue and fracture mechanics weldments. Contents also include an appendix for quick reference of tabular data on weldability of alloys, process selection, recommended interpass and heat treatment temperatures, and qualification codes and standards.