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PLASMA CUTTING

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A. The Plasma Cutter B. New Discoveries C. What is Plasma ? C. What is Plasma ? D. Inside a Plasma Cutter Swirl Ring Electrode Nozzle D. Inside a ... – PowerPoint PPT presentation

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Title: PLASMA CUTTING


1
PLASMA CUTTING
2
A. The Plasma Cutter
  • Been around since World War II.
  • Conceptually, a very simple tool.
  • Harnesses one of most prevalent
  • states of matter in universe - PLASMA

3
B. New Discoveries
  • Inert gas fed through an electric arc.
  • Breakthrough discovery Charging gas with
  • electric current formed barrier around weld.
  • Made cleaner joints sturdier construction.
  • Early 1960s boosted temperature by
  • speeding up flow shrinking release hole.
  • At higher temp, tool acted like a cutter
    instead
  • of a welder.

4
C. What is Plasma ?
  • Boosting a gas to extremely high temperature
  • produces plasma.
  • Gas molecules begin to break apart, atoms
  • begin to split nuclei become ions.
  • Ions collide with other nuclei and ions.
  • Collision releases vast amounts of energy.

5
C. What is Plasma ?
  • Plasma is Everywhere
  • 99 of all matter in universe is plasma.
  • Not common on Earth normal on the Sun.
  • Present in lightning.
  • Neon lights, fluorescent lighting, plasma
  • displays use cool plasma.

6
D. Inside a Plasma Cutter
  • Cutters
  • Electrode in center nozzle just below it.
  • Swirl ring causes plasma to turn rapidly.
  • All sizes hand held or large industrial.

7
D. Inside a Plasma Cutter
  • 2. Making Plasma
  • Sending pressurized gas nitrogen, argon,
  • oxygen through a small channel.
  • Applying power to negatively charged
  • electrode a creates electric circuit.
  • Heat causes gas to reach fourth state of
  • matter - PLASMA.
  • Creates stream of plasma 30,000o F
  • moving at 20,000 feet per second.

8
D. Inside a Plasma Cutter
  • 3. Plasma Cutting Technology
  • Superheated, compressed air.
  • Ionizes to form conductive gas.
  • Gas conducts electricity from plasma
  • cutter to work piece.
  • Arc melts and blows away metal.

9
  1. Plasma Cutting Technology
  • How Does Plasma Compare to Oxyacetylene ?
  • Oxyacetylene slowly burns through metal
    limited
  • to steel and other ferrous metals.
  • Plasma melts metal and blows it away.
  • Plasma does not require use of flammable or
  • explosive materials.
  • Drawbacks to Plasma
  • More expensive
  • Requires access to electricity compressed air.

10
  1. Plasma Cutting Technology
  • Thickness
  • Most units rated on cutting ability and
    amperage.
  • Smaller units make sever cut leaves
    behind
  • dross and slag.
  • ¼- inch machine has about 25 amps output
  • ½-inch machine has 50-60 amp output.
  • ¾ to 1-inch machine has 80 amp output.
  • Cutting Speed
  • Good rule of thumb Choose machine that can
  • handle approx. twice your normal cutting
    thickness.
  • Duty cycle Time you can continuously cut
    before
  • machine overheats.

11
  1. Plasma Cutting Technology
  • Initiating the Cutting Arc
  • Most units have a pilot arc utilizing high
    frequency.
  • High frequency may interfere with computers.
  • Consumables
  • Parts that wear out or supplies that get used
    up.
  • Make sure to compare same data between
    machines.
  • Arc Transfer
  • Transfer occurs when pilot arc is close to
    work piece.
  • After arc transfers, a switch opens current
    path.
  • Quick transfer to cutting, with larger
    transfer height.

12
  1. Plasma Cutting Technology
  • Maintaining Efficiency
  • Filters remove oil from compressed air.
  • Oil can cause arcing and reduce cutting
    ability.
  • Before starting, check for
  • Clean air supply without water or oil.
  • Consumable wear and burn marks.
  • Correct air pressure.
  • Nozzle and electrode in correct place.
  • Clean ground connection.

13
4. Plasma Cutting Safety
Machine should have Nozzle in Place sensor.
Plasma cutter will not start an arc unless
nozzle is there. Look for pre-flow sequence and 3
second pre-flow safety.
  • Basic Safety Practices
  • Read instruction manual thoroughly.
  • Always wear long sleeves and gloves.
  • Dark goggles or weld shield required. Shade
    7 - 9
  • Discuss all tips and guidelines in your
    manual.
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