6ME6.2: WELDING ENGINEERING (Elective)
Welding as compared with
other fabrication processes. Basic classification of welding
processes.
Mechanism of arc initiation and maintenance, temperature
distribution in arc. Arc characteristics and forces.
Fusion welding: Critical
reviews of manual metal arc, TIG, MIG Co 2 & submerged arc
welding electroslag & Electro gas welding
Electrode selection, filler
materials, fluxes. Specifications and characterisation of various power sources
in arc welding, mechanism and type of metal transfer in arc welding, factors
controlling melting rate in welding processes influence of magnetic field on are
welding characteristics.
Resistance welding: Techniques & application of
various resistance welding processes, Thermit welding, solid state welding,
Friction, diffusion & cold pressure welding metal cladding, Modern welding
processes: Ultrasonic, Electoral beam, Plasma arc; welding Metal
Spraying.
Welding metallurgy: Weldability, metallurgical changes occuring
during fusion welding, welding of ferrous and non-ferrous metals and alloys.
Effect of alloying elements in welding. Heat flow in welding peak temperature,
width of heat affected zone. Cooling rates and solidification rates, weld
thermal cycles, residual stresses and their measurement, weld distortion and its
prevention. Thermal cutting processes: Oxygen cutting, plasma arc cutting, air
carbon cutting & laser cutting techniques.
Welding defects testing &
adhesive bonding. mechanism, techniques & scope of brazing, soldering and
bonding processes. Weld cracking: Mechanism of cold and hot cracking, Hydrogen
embrittlement, determination of hydrogen dissolved in weld metal techniques for
welding without hydrogen.
Specific applications of welding: Welding of
pressure vessels, industrial piping, reactor metals, Storage tanks, cladding,
metallizing and surfacing. Under water welding.
List of Recommended
Books:
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Welding Handbook, American Welding Society.
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Welding Processes, Croft, Cambridge University Press.
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Welding for Engineers, Udin Fruk &
Wultf, John Wiley
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Welding Technology, Rossi, McGraw Hill
-
Welding Technology,
R.S.Parmar, Khanna Publishers.
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