Evaluation of the Double Ellipsoid Model
In order to minimize the computing cost the initial analysis was done in the plane normal to the welding direction as shown in figures 2-19 and 2-20. Thus, heat flow …
Kinematic Models for Welding Heat Transfer
Having selected a model for the heat source, the analyst has the option of assuming that the heat flows only in cross-sectional planes, only in the plane of the plate, …
Double Ellipsoidal Power Density Distribution
Calculation experience with the ellipsoidal heat source model revealed that the temperature gradient in front of the heat source was not as steep as expected and the gentler gradient at …
Hemispherical Power Density Distribution
For welding situations, where the effective depth of penetration is small, the surface heat source model of Pavelic, Friedman and Krutz has been quite successful. However, for high power density …
Gaussian Surface Flux Distribution
In the ‘circular disc’ model proposed by Pavelic et al [40], the thermal flux has a Gaussian or normal distribution in the plane, Figure 2-6: q(r) = q(0)e~cr (24) where: …
Model Considerations
The interaction of a heat source (arc, electron beam or laser) with a weld pool is a complex physical phenomenon that still cannot be modeled rigorously. It is known that …
Models for Welding Heat Sources
Theoretical Formulations The basic theory of heat flow that was developed by Fourier and applied to moving heat sources by Rosenthal [38] and Rykalin [37] in the late 1930s is …
The Computing Environment
2.2.1 Computational Geometry In computer aided drafting, the computer stores the lines and symbols from the drawing, but does not understand them and cannot interpret them. With wire frame models …
MANUFACTURING
Figure 2-1: Tools for evaluation of manufacturing effects between functional evaluation and planning of manufacturing (vertical) also between concept and details (horizontal), from [3 and 4]. In Figure 2-1, the …
Computer Simulation of Welding Processes
Introduction and Synopsis Computer aided Design (CAD) and analysis and Computer Integrated Manufacturing (СІМ) are popular topics for research. Computer aided drafting and engineering analysis such as Finite Element Method …
Major objective of this book
The content of this book is divided into nine chapters. This short chapter is an introduction to the following chapters that discuss various subjects related to “Computational Welding Mechanics”. “Computer …
Mechanical Behavior of Welds
From the industry point of view, the most critical mechanical effects of welding are cracking, distortion and buckling. The influence of welds on crack propagation in stress corrosion cracking, fatigue …
Brief History of Computational Welding Mechanics
Historically, arc welding began shortly after electrical power became available in the late 1800s. Serious scientific studies date from at least the 1930s. The failure of welded bridges in Europe …
Introduction and Synopsis
Welding as a fabrication technique presents a number of difficult problems to the design and manufacturing community. Nowhere is this more evident than in the aerospace industry with its emphasis …
COMPUTATIONAL WELDING MECHANICS
COMPUTATIONAL WELDING MECHANICS
