Tweco 281 Thermal Arc Fabricator - Manual (Page 8)

FABRICATOR 281
1-2 April 10, 2008
3. Use protective screens or barriers to protect others from flash
and glare; warn others not to watch the arc.
4. Wear protective clothing made from durable, flame-resistant
material (wool and leather) and foot protection.
5. Use approved ear plugs or ear muffs if noise level is high.
WARNING
FUMES AND GASES can be hazardous to your health.
Welding produces fumes and gases. Breathing these
fumes and gases can be hazardous to your health.
1. Keep your head out of the fumes. Do not breath the fumes.
2. If inside, ventilate the area and/or use exhaust at the arc to remove
welding fumes and gases.
3. If ventilation is poor, use an approved air-supplied respirator.
4. Read the Material Safety Data Sheets (MSDSs) and the
manufacturer’s instruction for metals, consumables, coatings, and
cleaners.
5. Work in a confined space only if it is well ventilated, or while
wearing an air-supplied respirator. Shielding gases used for
welding can displace air causing injury or death. Be sure the
breathing air is safe.
6. Do not weld in locations near degreasing, cleaning, or spraying
operations. The heat and rays of the arc can react with vapors to
form highly toxic and irritating gases.
7. Do not weld on coated metals, such as galvanized, lead, or
cadmium plated steel, unless the coating is removed from the
weld area, the area is well ventilated, and if necessary, while
wearing an air-supplied respirator. The coatings and any metals
containing these elements can give off toxic fumes if welded.
WARNING
WELDING can cause fire or explosion.
Sparks and spatter fly off from the welding arc. The flying
sparks and hot metal, weld spatter, hot workpiece, and
hot equipment can cause fires and burns. Accidental
contact of electrode or welding wire to metal objects
can cause sparks, overheating, or fire.
1. Protect yourself and others from flying sparks and hot metal.
2. Do not weld where flying sparks can strike flammable material.
3. Remove all flammables within 35 ft (10.7 m) of the welding arc.
If this is not possible, tightly cover them with approved covers.
4. Be alert that welding sparks and hot materials from welding can
easily go through small cracks and openings to adjacent areas.
5. Watch for fire, and keep a fire extinguisher nearby.
6. Be aware that welding on a ceiling, floor, bulkhead, or partition
can cause fire on the hidden side.
7. Do not weld on closed containers such as tanks or drums.
8. Connect work cable to the work as close to the welding area as
practical to prevent welding current from traveling long, possibly
unknown paths and causing electric shock and fire hazards.
9. Do not use welder to thaw frozen pipes.
10. Remove stick electrode from holder or cut off welding wire at
contact tip when not in use.
Welding or Cutting
Operation
Electrode Size Metal
Thickness or Welding
Filter
Shade
Welding or Cutting
Operation
Electrode Size Metal
Thickness or Welding
Filter
Shade
Torch Soldering All 2 Gas Tungsten Arc Welding
Torch Brazing All 3 or 4 Light Under 50 Amp 10
Medium 50 to 150 Amp 12
Light Under 1 in., 25 mm 3 or 4 Heavy 150 to 500 Amp 14
Medium 1 – 6 in., 25 – 150 mm 4 or 5 Atomic Hydrogen Welding All 12
Heavy Over 6 in., 150 mm 5 or 6 Carbon Arc Welding All 14
Light Under 1/8 in., 3 mm 4 or 5 Light 12
Medium 1/8 – 1/2 in., 3 – 12 mm 5 or 6 Heavy 14
Heavy Over 1/2 in., 12 mm 6 or 8
Light Under 20 Amp 6 to 8
Light Under 5/32 in., 4 mm 10 Light 20 to 100 Amp 10
Medium Under 5/32 to ¼ in., 4 to 6.4m 12 Medium 100 to 400 Amp 12
Heavy Over ¼ in., 6.4 mm 14 Heavy 400 to 800 Amp 14
Light Under 60 Amp 7 Light Under 300 Amp 9
Light 60 to 160 Amp 11 Medium 300 to 400 Amp 12
Medium 160 to 250 Amp 12 Heavy 400 to 800 Amp 14
Heavy 250 to 500 Amp 14
Carbon Arc Gouging
Plasma Arc Welding
Eye protection filter shade selector for welding or cutting (goggles or helmet), from AWS/ANSI Z49.1:1999
Plasma Arc Cutting
Oxygen Cutting
Gas Metal Arc Welding
Gas Welding
Shielded Metal-Arc Welding (Stick) Electrodes