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PLASMA CUTTER

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The electricity is used for cutting and the air blows away the sparks and melted ... electric arc through a small orifice, the torch delivers a high concentration ... – PowerPoint PPT presentation

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Title: PLASMA CUTTER


1
PLASMA CUTTER
  • WELDING
  • JANUARY 2006

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4
PLASMA CUTTER
  • Industry standards to replace Oxy-Acetylene
    torches.
  • Also a cleaner cut.
  • Uses electricity and compress air. The
    electricity is used for cutting and the air blows
    away the sparks and melted metal.
  • Use Safety glasses to protect your eyes from the
    rays coming off the machine
  • Make sure air lines are water free. Plasma
    cutter hates water.
  • The Plasma cutter should cut up to 1/2" thick
    metal.

5
A. Plasma Gas Flow.
  • Plasma is a gas which has been heated to an
    extremely high temperature and ionized so that it
    becomes electrically conductive.
  • The plasma arc cutting and gouging processes use
    this plasma to transfer an electrical arc to the
    workplace. The metal to be cut or removed is
    melted by the heat of the arc and then blown
    away.
  • While the goal of plasma arc cutting is
    separation of the materials, plasma arc gouging
    is used to remove metals to a controlled depth
    and width.

6
Plasma Basics
  • Plasma looks and behaves like a high-temperature
    gas, but with an important difference it
    conducts electricity and cuts any electrically
    conductive metal.
  • The plasma arc results from electrically heating
    a gas, typically air, to a very high temperature.
    This ionizes its atoms and enables them to
    conduct electricity.
  • A plasma arc torch uses a "swirl ring" that
    spins the gas around an electrode. The gas is
    heated in the chamber between the electrode and
    torch tip, ionizing the gas and creating plasma.
    This causes the plasma gas to greatly expand in
    volume and pressure. The small, narrow opening of
    the torch tip constricts the plasma and
    accelerates it toward the work piece at very high
    speeds (20,000 ft./s) and temperatures (up to
    30,000 F).
  • The high-intensity plasma jet melts a very
    localized area.
  • The force of the jet (or arc) pushes through the
    work piece and removes the molten metal.
  • This jet easily cuts through metals with poor
    heat conductivity (stainless steel) or excellent
    conductivity (aluminum).
  • The flame created by an oxy-fuel torch lacks
    plasma's concentration and cuts stainless steel
    or aluminum so poorly (excess warping or dross)
    that professionals don't bother to use it they
    consider plasma arc cutting the standard process
    for these metals.

7
  • Cool gas enters Zone B, where a pilot arc between
    the electrode and the torch tip heats and ionizes
    the gas.
  • The main cutting arc then transfers to the work
    piece through the column of plasma gas in Zone C
  • By forcing the plasma gas and electric arc
    through a small orifice, the torch delivers a
    high concentration of heat to a small area. The
    stiff, constrict plasma arc is shown in Zone C.
    Direct current (DC) straight polarity is used for
    plasma cutting, as shown in the illustration.
  • Zone A channels a secondary gas that cools the
    torch. This gas also assists the high velocity
    plasma gas in blowing the molten metal out of the
    cut allowing for a fast, slag free cut.

B
B
A
C
C
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9
Operation of Plasma Cutter
  • Plug in plasma cutter to 220 volt circuit. (same
    as the welder)
  • Connect air line--check gages to make sure you
    have about 60 of line pressure
  • Adjust heat knob to the correct setting for the
    metal. The higher the setting the more heat.
  • Connect ground clamp to work.
  • Turn on--Red light should appear when ready.
  • With eye protection "hit" the black top knob and
    red bottom knob on handle.
  • Make sure your are at the right distance with
    handle
  • Cut.

10
 Problems Using the Plasma Cutter
  • Make sure ground clamp is connected to metal
  • You have 60 of air pressure
  • If plasma cutter does not work--check and change
    cutting tip and nozzle.
  • Check to make sure there is no water in the line
  • Check for voltage drop.

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