What air pressure is required for CAC-A?

What air pressure is required for CAC-A?

• A. 60-80 psi
• B. 80-100 psi
• C. 100-120 psi
• D. 120-140 psi

Answer: (B)

In CAC-A, the cutting action relies on a carbon arc plus a stream of compressed air that blows away the molten metal and slag as the arc forms the cut. The air pressure must be high enough to clear debris and keep the cut clean, but not so high that it distorts the arc or erodes the nozzle or workpiece. The typical operating range is 80–100 psi because it provides a steady air flow that effectively clears material without destabilizing the arc. If the pressure is too low, slag removal suffers and the cut can be slow and ragged. If the pressure is too high, the air jet can disrupt the arc, increase nozzle wear, and worsen cut quality, especially on thinner materials. For consistent results, use a clean, dry air supply and regulate the pressure close to the nozzle.

In CAC-A, the cutting action relies on a carbon arc plus a stream of compressed air that blows away the molten metal and slag as the arc forms the cut. The air pressure must be high enough to clear debris and keep the cut clean, but not so high that it distorts the arc or erodes the nozzle or workpiece.

The typical operating range is 80–100 psi because it provides a steady air flow that effectively clears material without destabilizing the arc. If the pressure is too low, slag removal suffers and the cut can be slow and ragged. If the pressure is too high, the air jet can disrupt the arc, increase nozzle wear, and worsen cut quality, especially on thinner materials. For consistent results, use a clean, dry air supply and regulate the pressure close to the nozzle.