Welding Power Sources

Types

• Welding power sources can be divided into constant current and constant voltage. Constant current power sources vary the output with a steady current, such as manual metal arc welding and TIG welders that use tungsten inert gas. Constant voltage power sources fluctuate the output, according to a set voltage and adjusted amps. Welders that work with MIG/MAG (metal inert gas) and SUBARC (Submerged Arc-welding) use constant voltage power sources to weld out of position -- when you must weld in a position other than a flat position.

AC Power Sources

• AC welding power sources include fixed and variable current welding transformers. AC power sources require a small investment and are simple to use and maintain. However, they can also be inefficient, are not very portable and have low deposition rates.

DC Power Sources

• DC welding power sources are those that feed the electrical output in only one direction. Types of DC welding power sources include transductors, thyristorized, chopper-based and inverter-based. Thyristorized power sources are inexpensive, but are not portable and are more difficult to use. Chopper-based power sources consist of a transistor and diode. They are portable and offer good arc control. Most of these sources must be repaired by a trained technician.

Static Vs. Rotating Power Sources

• Static power sources are stationary power sources that you plug in, or AC power. Motor generators and engine-driven devices are two types of rotating power sources. Motor generators are a combination of a motor and a generator that produces an electric current. Gasoline or diesel fuel engine-driven power sources.