Question

select all advantages of pac. (select all that apply.)

no preheat
less distortion
minimal training
low cost
fast cutting speeds
portable
cuts electrically conductive metals
dross-free

Explanation:

Identify process characteristics

Plasma Arc Cutting (PAC) uses a constricted electric arc to melt conductive metals, with high-velocity gas blowing the molten metal away. Unlike oxy-fuel cutting, it does not rely on a chemical oxidation reaction, meaning it requires no preheating of the metal.

Evaluate speed and distortion

Because the plasma arc is extremely hot and concentrated, PAC operates at very fast cutting speeds. This high speed minimizes the heat-affected zone, resulting in less thermal distortion of the workpiece compared to oxy-fuel cutting.

Evaluate material capabilities

PAC can cut any electrically conductive metal, including stainless steel, aluminum, copper, and brass, which cannot be easily cut with standard oxy-fuel systems.

Analyze non-advantages

PAC systems have high initial equipment costs (not low cost) and require proper training to operate safely and effectively (not minimal training). While modern systems are highly optimized, they are not entirely dross-free under all conditions, and portability is generally comparable to or less than simple oxy-fuel setups due to the need for electrical power and compressed air. Therefore, the primary advantages are no preheat, less distortion, fast cutting speeds, and the ability to cut electrically conductive metals.

Answer:

• No preheat (Correct answer)
• Less distortion (Correct answer)
• Minimal training
• Low cost
• Fast cutting speeds (Correct answer)
• Portable
• Cuts electrically conductive metals (Correct answer)
• Dross-free