Plasma Cutting and Carbon Arc Gouging Test Review

Flashcards about Plasma Arc Cutting (PAC) and Carbon Arc Gouging (CAC-A)

What are the major safety risks of PAC?

Fumes, noise hazards, and toxic chlorinated gas emissions

What is dross?

Re-solidified oxidized molten metal

What is the main difference between PAC and CAC-A?

PAC uses ionized gas; CAC-A uses a carbon electrode

What is the purpose of compressed air in CAC-A?

Blow molten metal away

What shade filter is recommended for PAC currents under 300 A?

8

What is one hazard unique to CAC-A versus PAC?

Surface hardening

Which power source is recommended for CAC-A with all electrode sizes?

Constant voltage AC transformer

What electrode type is used for CAC-A on AC power?

AC copper-coated

What occurs if the CAC-A electrode stick-out is less than 2"?

Torch damage

What type of gas is used in the plasma arc cutting process?

Ionized gas

Plasma arc cutting is effective on which type of materials?

All electrically conductive metals

What is a transferred arc in PAC?

Arc established between the torch tip and workpiece

What is the purpose of the shielding gas in a dual-flow torch?

Protect kerf walls from oxidation

Which gas is most commonly used with hafnium tips for carbon steel?

Compressed air

What is the recommended standoff distance for most PAC?

3 mm to 6 mm

What component constricts the plasma arc in the torch?

Nozzle

What happens when the PAC trigger is pressed after unlocking?

Pilot arc is established

Which metal should NOT be cut with CAC-A due to toxic fumes?

Lead

What air pressure is typically required for CAC-A?

550-700 kPa (80-100 psi)

How can carbon contamination be minimized in CAC-A?

Maintain proper technique and air flow