arc welding is powered by

Arc welding is powered by an electric current, supplied from an external welding power source that converts mains electricity into low-voltage, high- current power.

What powers arc welding?

• Arc welding uses electrical energy to create an arc between an electrode and the workpiece, generating the heat needed to melt metal.

• The power source typically takes high-voltage AC from the grid and turns it into low-voltage, high-current output suitable for welding (often in the range of 10–50 V and 50–300 A).

Types of electrical power used

• Arc welding can use either direct current (DC) or alternating current (AC), depending on the process and equipment design.

• Modern machines may provide constant-current or constant-voltage outputs, chosen to match specific welding processes such as manual metal arc (SMAW), MIG/MAG, or TIG.

Common power source designs

• Traditional units include transformer-based AC sources, rectifiers that convert AC to DC, and motor-generator sets.

• Newer inverter-based sources use electronics to convert and control power more efficiently, offering lighter weight and finer control over the welding arc.

Simple exam-style answer

• If the question is “Arc welding is powered by ___,” the most concise correct fill is: electric current (from an external welding power source).

Information gathered from public data available on the internet and portrayed here.