Emf Information; Plasma Arc Cutting Hazards - Forney 700P Manuel D'utilisation

EMF Information

Considerations about Welding or Cutting and the Effects of Low Frequency Electric and Magnetic Fields
Welding or cutting current, as it flows through the welding or cutting cables, will cause electromagnetic
fields. There has been and still is some concern about such fields. However, after examining more than
committee of the National Research Council concluded that: "The body of evidence, in the committee's
judgment, has not demonstrated that exposure to power-frequency electric and a magnetic field is a
human health hazard." However, studies are still going forth and evidence continues to be examined.
Until the final conclusions of the research are reached, you may wish to minimize your exposure to
electromagnetic fields when welding or cutting.
To reduce magnetic fields in the workplace, use the following procedures:
1. Keep cables close together by twisting or taping them.
2. Arrange cables to one side and away from the operator.
3. Do not coil or drape cables around your body.
4. Keep cutting power source and cables as far away from operator as practical.
5. Connect work clamp to work piece as close to the cut as possible.
ABOUT PACEMAKERS & HEARING AIDS:
Pacemaker & Hearing Aid wearers consult your doctor first. If cleared by your doctor, then following
the above procedures is recommended.

Plasma Arc Cutting Hazards

CUTTING CAN CAUSE FIRE OR EXPLOSION.
Hot metal and sparks blow out from the cutting arc. The flying sparks and hot metal, hot work
piece, and hot equipment can cause fires and burns. Check and be sure the area is safe before
doing any cutting.
• Do not cut where flying sparks can strike flammable material.
• Connect work cable to the work as close to the cutting area as practical to prevent cutting
current from traveling long, possibly unknown paths and causing electric shock and fire
hazards.
• Never cut containers with potentially flammable materials inside - they must be emptied and
properly cleaned first.
• Do not cut in atmospheres containing explosive dust or vapors.
• Do not cut pressurized cylinders, pipes, or vessels.
• Do not cut containers that have held combustibles.
ELECTRIC SHOCK CAN KILL.
Touching live electrical parts can cause fatal shocks or severe burns. The torch and work circuit
are electrically live whenever the output is on. The input power circuit and machine internal
circuits are also live when power is on. Plasma arc cutting requires higher voltages than welding
to start and maintain the arc (200 to 400 volts DC are common), but also uses torches designed
with safety interlock systems which turn off the machine when the shield cup is loosened or if tip
touches electrode inside the nozzle. Incorrectly installed or improperly grounded equipment is a
hazard.
• Do not, in any manner, come into physi cal contact with any part of the welding current
circuit. The welding current circuit includes:
a.
b.
c.
d.
6
the work piece or any conductive material in contact with it,
the ground clamp,
the electrode or welding wire,
any metal parts on the electrode holder, or wire feed gun.
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