Thermal Arc 400 GTSW AC/DC, Operating Manual

Page: 7 / 52

iii INTRODUCTION
Gases and Fumes
(continued)
Arc Rays
IMPORTANT SAFETY PRECAUTIONS (continued)
Metals coated with or containing materials that emit toxic fumes
should not be heated unless coating is removed from work
surface and work area is well ventilated. Wear an air-supplied
respirator if necessary.
Vapors from chlorinated solvents can be decomposed by the heat
of the arc or flame to form phosgene, a highly toxic gas, and other
lung and eye irritating products. The ultraviolet radiant energy
of the arc can also decompose trichloroethylene and perchloro-
ethylene vapors to form phosgene. Do not weld or cut where
solvent vapors may be drawn into the welding or cutting atmo-
sphere or where radiant energy may penetrate to atmospheres
containing even minute amounts of trichloroethylene or perchlo-
roethylene. Solvents, degreasers, and potential sources of these
vapors must be removed from the operating area.
Oil or grease in the presence of oxygen may ignite and burn
violently. Keep cylinders, valves, couplings, regulators, hoses,
and other apparatus clean and free from oil and grease. Oxygen
cylinders and apparatus should not be handled with oily hands
or gloves. Do not allow an oxygen stream to contact oily or
greasy surfaces.
Do not use oxygen as a substitute for compressed air.
NEVER ventilate with oxygen.
Generator engine exhaust must be vented to the outside air.
Carbon monoxide can kill.
ARC RAYS can injure eyes and burn skin.
Never look at an electric arc without protection. Protect eyes
from exposure to arc. Looking at an arc momentarily with
unprotected eyes (particularly a high intensity gas-shielded arc)
can cause permanent damage to vision.
Use a welding helmet or shield with proper filter (see chart on
page v). Place over face before striking arc.
Protect filter plate with a clear cover plate.
Do not use cracked or broken helmet or shield; radiation can pass
through to cause burns.
Replace any cracked, broken or loose filter plates immediately.
Replace clear cover plate when broken, pitted, or spattered.
Flash goggles with side shields must be worn under helmet to
protect eyes in case helmet is not in position before arc is struck.
Wear proper protective clothing. Arc rays can penetrate light-
weight clothing,
Welding arc rays can reflect from light-colored surfaces.