If a welder were to attempt to use a CV machine for a shielded metal arc welding (SMAW) task, the small fluctuations in the arc distance would cause significant fluctuations in the machine's current output. The nature of the CV machine is required by gas metal arc welding and flux-cored arc welding because the welder is not able to control the arc length manually. Shielded metal arc welding and gas tungsten arc welding will use a constant current source and gas metal arc welding and flux-cored arc welding typically use constant voltage sources but constant current is also possible with a voltage sensing wire feeder. Welding machines are usually classified as constant current (CC) or constant voltage (CV) a constant current machine varies its output voltage to maintain a steady current while a constant voltage machine will fluctuate its output current to maintain a set voltage. However, in some welding applications, notably SMAW, used in areas isolated from power grids, welding power supplies are used that combine the functions of electrical generation and current modulation into a single mobile unit mounted on a vehicle or towed trailer. The majority of welding power supplies do not generate power, instead functioning as controllable transformers that allow the operator to adjust electrical properties as needed. The operator can set these factors to within the parameters as needed by the metal type, thickness, and technique to be used. Power supplies for welding processes that use shielding gas also offer connections for gas and methods to control gas flow. Welding power supplies primarily serve as devices that allow a welder to exercise control over whether current is alternating current (AC) or direct current (DC), as well as the amount of current and voltage. There are multiple arc welding processes in common use ranging from relatively simple Shielded Metal Arc Welding (SMAW) to more complicated welding processes using inert shielding gas like Gas metal arc welding (GMAW) or Gas tungsten arc welding (GTAW). ( Learn how and when to remove this template message)Ī welding power supply is a device that provides or modulates an electric current to perform arc welding. JSTOR ( March 2013) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.įind sources: "Welding power supply" – news Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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