The welding machine, or welding power supply, provides electric current for the project. The welding gun contains an electrode uses the electricity from the power source to create an arc between itself and the metal.
A standard welding project takes a power supply of between 90-120 amps. Most advanced power supplies are made with silicon controlled rectifier technology and can use up over 12,000 amps. Most welding machines are plugged into regular AC power and then convert the electricity to DC for welding.
Welding guns differ depending on the type of welding types of welding like gas metal arc welding use consumable electrodes and others use non-consumable electrodes. For gas metal arc welding (GMAW), the gun contains a trigger or control switch that, when pressed, creates a wire feed as well as initiates electrical current and the inert or semi-inert gas that keeps the weld clean of contaminants. There are features that maintain the constant current, for instance the consumable wire is protected by the electrode conduit and liner. A GMAW gun also includes a gas nozzle to regulate and stabilize the stream of shielding gas that flow is also uninterrupted and smooth. A gas hose is also attached to the gun to transmit the gas to the nozzles, and a water hose is sometimes included to cool the gun.
Safety is Important in Welding
Welders protect themselves from burns from the electricity and flame involved in welding with long sleeve jackets, shaded welding helmets, leather gloves and welding goggles.
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