Electrical Power for Arc Welding

Provided by: ToolingU

“Electrical Power for Arc Welding” explains the basic principles of electricity and the effect that electricity has on arc welding processes. Electricity travels in closed circuits. A basic circuit consists of a source, path, load, and control. Current is the flow of electricity. Voltage is the force that pushes current through a circuit. Resistance opposes current flow, but also makes it possible for electricity to perform work. Electrical work is called wattage. In welding circuits, the resistance of the arc converts electricity into light and heat, which melts the base metals. After taking this class, users will have a foundational understanding of electricity, electrical variables, and how electricity is used in arc welding. This will prepare users for welding, since every welder must understand basic electrical concepts to work with the arc and the welding equipment that produces the arc.

Course Objectives:

  • Describe electricity
  • Describe the components of an arc welding circuit
  • Describe current in arc welding
  • Describe voltage in arc welding
  • Describe resistance in arc welding
  • Explain the relationships between current, voltage, and resistance
  • Distinguish between direct current and alternating current
  • List common uses of AC and DC power
  • Distinguish between DCEN polarity and DCEP polarity
  • Describe arc blow
  • Contrast constant current and constant voltage power
  • Describe arc welding power sources
  • Explain power conversion for arc welding
  • Describe grounding in arc welding
  • Describe electrical safety hazards and precautions for arc welding
  • Describe inspection and troubleshooting practices for arc welding equipment.

Recommended Background

  • Recommended for manufacturing personnel, including engineers, technicians and managers, particularly handling welding operations.

Course ID







Communication, Critical Thinking, Personal Effectiveness, Arc Welding, Components, Elecricity, Power Sources, Electrical Safety

Method of Delivery


Estimated Effort

2.5 hrs



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