Wednesday, August 4, 2010

Metal workshop

Welding is a way of heating pieces of metal using electricity or a flame so that they melt and stick together. There are many kinds of welding, including arc welding, resistance welding, and gas welding. The most common type is arc welding. One kind of welding that does not use an arc is Oxy-fuel welding (OFW), sometimes called gas welding. OFW uses a flame to heat up the metal. There are other kinds of welding that do not use an arc.

Arc Welding
Any welding process that utilizes an electrical arc is known as arc welding. The common forms of arc welding include:

Shielded metal arc welding (SMAW): SMAW is also known as "stick" welding.

Gas metal arc welding (GMAW): GMAW is also known as MIG (metal/inert gas welding).

Gas tungsten arc welding (GTAW): GTAW is also known as TIG (tungsten inert gas welding).

A lot of electricity is used in arc welding. Some kinds of welding use alternating current like the electricity that buildings use. Other kinds use direct current like the electricity in a car or most things with a battery. Almost all kinds of welding use a lower voltage than the electricity that comes from a power plant. Arc welding requires using a special power supply that makes the electricity from the power plant usable for welding. A power supply lowers the voltage and controls the amount of current.

Metal rods and pipes are bend with the help of pulley system of different radii.


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