MCQ'S on Tungsten Inert Gas Welding-TIG/GTAW, Metal Inert Gas Welding -MIG/GMAW & Plasma Arc welding

#Multiple choice question
#TungstenInertGaswelding
#TIG
#GTAW
#MetalInertGasWelding
#MIG
#GMAW
#PlasmaArcwelding
#TungstenInertGas
#GasTungstentArc Welding
#GTAW
is an arc welding process that produces the weld with a non-consumable tungsten electrode.
Tungsten inert gas (TIG) welding became an overnight success in the 1940s for joining magnesium and aluminum. Using an inert gas shield instead of a slag to protect the weld pool, the process was a highly attractive replacement for gas and manual metal arc welding. TIG has played a major role in the acceptance of aluminum for high quality welding and structural applications.
n the TIG welding process the arc is formed between a pointed tungsten electrode and the workpiece in an inert atmosphere of argon or helium.
TIG welding must be operated with a drooping, constant current power source - either DC or AC.
MIG (Metal Inert Gas) welding is a welding process in which an electric arc forms between a consumable wire electrode and the work piece. This process uses inert gases or gas mixtures as the shielding gas. Argon and helium are typically used for the MIG welding of non-ferrous metals such as aluminum.
Plasma arc welding (PAW) is an arc welding process similar to gas tungsten arc welding (GTAW). The electric arc is formed between an electrode (which is usually but not always made of sintered tungsten) and the workpiece. The key difference from GTAW is that in PAW, the electrode is positioned within the body of the torch, so the plasma arc is separated from the shielding gas envelope. The plasma is then forced through a fine-bore copper nozzle which constricts the arc and the plasma exits the orifice at high velocities (approaching the speed of sound) and a temperature approaching 28,000 °C (50,000 °F) or higher.
Arc plasma is a temporary state of a gas. The gas gets ionized by electric current passing through it and it becomes a conductor of electricity. In ionized state, atoms are broken into electrons (−) and cations (+) and the system contains a mixture of ions, electrons and highly excited atoms. The degree of ionization may be between 1% and greater than 100% (possible with double and triple degrees of ionization). Such states exist as more electrons are pulled from their orbits.

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