This book describes and systemizes analytical and numerical
solutions for a broad range of instantaneous and continuous,
stationary and moving, concentrated and distributed, 1D, 2D and 3D
heat sources in semi-infinite bodies, thick plane layers, thin
plates and cylinders under various boundary conditions. The
analytical solutions were mainly obtained by the superimposing
principle for various parts of the proposed 1D, 2D and 3D heat
sources and based on the assumption that only heat conduction plays
a major role in the thermal analysis of welds. Other complex
effects of heat transfer in weld phenomena are incorporated in the
solutions by means of various geometrical and energetic parameters
of the heat source. The book is divided into 13 chapters. Chapter 1
briefly reviews various welding processes and the energy
characteristics of welding heat sources, while Chapter 2 covers the
main thermophysical properties of the most commonly used alloys.
Chapter 3 describes the physical fundamentals of heat conduction
during welding, and Chapter 4 introduces several useful methods for
solving the problem of heat conduction in welding. Chapters 5 and 6
focus on the derivation of analytical solutions for many types of
heat sources in semi-infinite bodies, thick plane layers, thin
plates and cylinders under various boundary conditions. The heat
sources can be instantaneous or continuous, stationary or moving,
concentrated or distributed (1D, 2D or 3D). In Chapter 7 the
temperature field under programmed heat input (pulsed power sources
and weaving sources) is analyzed. In turn, Chapters 8 and 9 cover
the thermal cycle, melting and solidification of the base metal.
Heating and melting of filler metal are considered in Chapter 10.
Chapter 11 addresses the formulation and solution of inverse heat
conduction problems using zero-, first- and second-order
algorithms, while Chapter 12 focuses on applying the solutions
developed here to the optimization of welding conditions. In
addition, case studies confirm the usefulness and feasibility of
the respective solutions. Lastly, Chapter 13 demonstrates the
prediction of local microstructure and mechanical properties of
welded joint metals, while taking into account their thermal cycle.
The book is intended for all researches, welding engineers,
mechanical design engineers, research engineers and postgraduate
students who deal with problems such as microstructure modeling of
welds, analysis of the mechanical properties of welded metals,
weldability, residual stresses and distortions, optimization of
welding and allied processes (prewelding heating, cladding, thermal
cutting, additive technologies, etc.). It also offers a useful
reference guide for software engineers who are interested in
writing application software for simulating welding processes,
microstructure modeling, residual stress analysis of welds, and for
robotic-welding control systems.
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