Summary of "Lecture 01 : Introduction : Manufacturing and Joining"

The lecture introduces the concept of manufacturing and Joining technologies for Metals.

Manufacturing processes are used to give desired size, shape, and properties to materials.
Different shapes and properties are achieved through various processes, including Chemical composition modification and Heat treatment.
Simple shapes can be easily manufactured through processes like Forging and Casting, while complex shapes may require additional processes like machining.
Material properties such as mechanical, physical, chemical, and dimensional properties significantly impact the selection of Manufacturing processes.
Joining processes involve bringing simpler components together to achieve desired size and shape.
Joining can be achieved through mechanical, chemical, or adhesive methods, as well as welding.
Welding involves fusion, deformation, or diffusion of components using heat or pressure.
Welded joints have unique characteristics, including residual stresses, partial melting, weld thermal cycles, and chemical/mechanical/metallurgical heterogeneity.
Considerations for selecting joining processes include material properties, availability of consumables, criticality of application, service conditions, and economy.
Advantages of welding include producing permanent, strong joints economically, while disadvantages include the need for expertise, high labor costs, and poor reliability.
Common welding processes and their applications include resistance welding in automobiles, thermite welding in railways, and gas tungsten arc welding in nuclear and aircraft applications.
The lecture concludes by mentioning the next topic of discussion on different approaches and classifications of joining processes.