Sunday, June 23, 2019

Welding: Processes, Quality, and Applications: Mechanical Engineering Theory and Applications

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Chapter 1 - At the beginning of this chapter the integral description and the microcharacterization of an intense electron beam are discussed. The beam parameters determination is given on base of the distribution functions and other beam characteristics in coordinate and impulse planes.

The analysis of powerful beams, utilized for electron beam welding (EBW) of machine parts, could be perfect, if we measure or calculate both: the radial and the angular beam current distributions. The beam emittance, involving these parameters, is the chosen value for the quality characterization of technology electron beams. In this way monitoring of the beam profile (i.e. distribution of the beam current density in a beam transverse cross-section) and evaluation the beam emittance are needed at standardization of EBW equipment and at providing the reproducibility of the EBW conditions.

Techniques, schemes and limits of such monitoring are described and analyzed. The signal formation features at devices for estimation of the beam profile of intense continuously operated electron beams are given. The role of space-frequency characteristics of the sampling scanning (modulation) system; limitations and peculiarities at assuming normal distribution of the monitored beam current density; the use of Abel back transformation; the application of computer-tomography method for the measuring the beam profile and the methods for simplification the estimation of the beam emittance are discussed.

Chapter 1: Design of High Brightness Welding Electron Guns and Characterization of Intense Electron Beam Quality
Chapter 2: Process Parameter Optimization and Quality Improvement at Electron Beam Welding
Chapter 3: Automation in Determining the Optimal Parameters for TIG Welding of Shells
Chapter 4: Friction Stir Welding: Flow Behaviour and Material Interactions of Two Similar and Two Dissimilar Metals and Their Weldment Properties
Chapter 5: Plastic Limit Load Solutions for Highly Undermatched Welded Joints
Chapter 6: Fracture and Fatigue Assessment of Welded Structures
Chapter 7: Laser Transmission Welding: A Novel Technique in Plastic Joining
Chapter 8: Effect of in Situ Reaction on the Property of Pulsed Nd:YAG Laser Welding SiCp/A356
Chapter 9: Residual Stress Evolution in Welded Joints Subject to four-Point Bending Fatigue Load

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