Welding Machines

In industrial context, welding refers to a fabricationfrom a set of taps on the transformer.
process that joins materials such as metals andSome welding machines use an internal combustion
thermoplastics, by causing coalescence. This isengine or an electric motor to drive the alternator or
typically done by softening the work pieces andgenerator present in these machines. The process
adding a filler material, which is often a welding rod,used is similar to transformer based welding machines
to form a pool of molten material that cools toas power is first converted into mechanical and back
become a strong joint. Various processes and energyto electrical energy to achieve the step-down affect.
sources are used for welding, such as gas flame,Inverter based welding machines use high-power
electric arc, laser, electric beam, friction, and ultrasemiconductors such as the IGBT for building a
sound.switching power supply capable of handling high loads
Welding machines can be broadly classified intoof arc welding. These machines convert utility
different categories depending on the type ofelectricity into high voltage and store it in a capacitor
welding processes and equipment used during thebank. The stored energy is then transferred to a
process. Some welding machines use transformerssecondary transformer for producing the desired
for converting high voltage, low current electricitywelding current.
into high current low voltage, often between 17 toWelding machines have simplified different types of
45 volts and 190 to 590 amperes. These types ofmachining jobs undertaken in small and large
welding machines are the least expensive and allowmanufacturing companies. Automated welding
welders to select the output current by eithermachines are also in use and have helped in increasing
moving the core of the transformer in and out ofthe effectiveness of welding processes.
the magnetic field or by allowing the welder to select