PRODUCTION TECHNOLOGY Chapter-2 Welding

PRODUCTION TECHNOLOGY

CHAPTER-1

Casting: Steps involved in making a casting-Its applications-patterns and Types of patterns-Pattern allowances and their construction. Types of casting processes-Solidification of casting

CHAPTER-2

Welding: Welding types-Oxy-fuel gas cutting-standard time and cost calculations. Arc welding, forge welding - resistance welding, thermit welding. Inert gas welding, TIG welding, MIG welding, friction welding, induction welding, explosive welding, laser welding, laser welding soldering and brazing, heat affected zone in welding. Welding defects – causes and remedies – destructive and non - destructive testing of welds.

CHAPTER-3

Heat Treatments: Hot working, cold working, strain hardening, recovery, crystallization and grain growth, Comparison of properties of cold and hot worked parts,

CHAPTER-4

Forming Techniques: rolling fundamentals – theory of rolling, types of rolling mills and products. Forces in rolling and power requirements. Stamping, forming and other cold working processes : blanking and piercing – Bending and forming – drawing and its types – wire drawing and tube drawing – coining – Hot and cold spinning – Types of presses and press tools. Forces and power requirement for the above operations.

CHAPTER-5

Extrusion of metals: Basic extrusion process and its characteristics. Hot extrusion and cold extrusion - Forward extrusion and backward extrusion –Impact extrusion – extruding equipment – Tube extrusion and pipe making, Hydrostatic extrusion. Forces in extrusion.

CHAPTER-6

Forging processes: Forging operations and principles – tools – forging methods – smith forging, drop forging – roll forging. Forging hammers: Rotary forging- forging defects, swaging, Forces in forging operations.