Cutting Systems, Power Sources & Advanced PAC
Copper-coated electrode functions, AAC vs OFC comparisons, inverter power sources, PAC power systems, and filter lens selection.
- Explain the purpose of copper coating on AAC electrodes
- Compare AAC and OFC processes for advantages and disadvantages
- Describe inverter power source advantages for PAC
- Identify the power source type used in PAC systems
- Select the correct filter lens shade for AAC gouging
Leçon 1
Copper Coatings & Electrode Functions
Purpose of Copper Coating
The copper coating on AAC electrodes serves a critical purpose - it allows high currents to be used during the gouging process. The copper layer improves electrical conductivity along the electrode length, ensuring consistent current flow from the electrode holder to the arc. Without the copper coating, the carbon electrode would have much higher electrical resistance, limiting the current that could safely pass through it.
AAC Electrode Types
There are several types of AAC electrodes available, but the most commonly used for mild steel applications is the DC copper-coated electrode. These electrodes are available in various diameters, and the diameter selected directly affects the groove width produced during gouging. The copper coating also extends electrode life by protecting the carbon from oxidation during storage.
Exam Tip
Remember that the purpose of the copper coating is to allow high currents to be used - not to reduce arc blow, reduce arc temperature, or make identification easier.
The copper coating on AAC electrodes improves electrical conductivity and allows high currents to be used. The most common electrode type for mild steel is the DC copper-coated electrode.