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Feb 10, 2016
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• For EG243 Welding:• Pressurizing• Lighting• Cutting• Shutting Down • the Airco 9500
Cutting Torch.
• Procedure, PowerPoint and pictures by Stephen Collins ([email protected])
• Demonstration by Robert Giffin
• Click on arrows at top to move to the next page or go back
December 12, 2003
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SAFETY
• Do not perform this procedure without supervision by an instructor.• Oxyacetylene equipment must be set up in accordance with
ANSI/AWS C4.2-90 before beginning.• This procedure is only for the Airco 9500 torch with a #144-1 tip.• Other manufacturers may require different procedures.• Other tip sizes require different pressures (see operator’s manual).• Adequate ventilation must be provided to avoid hazardous
accumulation of flammable, explosive, and toxic gases.
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PERSONAL SAFETY EQUIPMENT
• Wear:– Safety glasses– Cotton clothing (no
nylon or polyester)– Long sleeves and pants– Leather boots– Leather welding gloves– #4 Cutting shield (not
shown in this picture)
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PRESSURIZING
• Back out both regulator adjusting “T” handles counterclockwise until they are completely loose
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PRESSURIZING
• Stand aside. Keep your face away from the gauges.
• Open the oxygen cylinder valve counterclockwise slowly at first.
• then all the way, tight up against the back seat.
• The cylinder pressure gauge should show pressure.
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PRESSURIZING
• Open the torch oxygen valve counterclockwise 1/2 turn.
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PRESSURIZING
• Turn oxygen regulator adjusting “T” handle clockwise.
• Set oxygen gauge working pressure at 30 psi.
• Oxygen should now be flowing from the torch tip.
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PRESSURIZING
• Purge 5 sec./50ft of hose.
• Close the torch oxygen valve clockwise.
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PRESSURIZING
• Stand aside. Keep your face away from the gauges.
• Open the acetylene cylinder valve counterclockwise until the cylinder gauge shows pressure,
• then another 1/4 to 1/2 turn counterclockwise but not more than 1 full turn total.
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PRESSURIZING
• Open torch acetylene valve 1/2 turn counterclockwise.
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PRESSURIZING
• Provide adequate ventilation to prevent accumulation of flammable gas.
• Turn acetylene regulator adjusting “T” handle clockwise.
• Set acetylene gauge working pressure to 4 psi.
• Acetylene should now be flowing from the torch tip
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PRESSURIZING
• Provide adequate ventilation to prevent accumulation of flammable gas.
• Purge 5 sec./50 ft. of hose
• Close torch acetylene valve.
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LIGHTING
• FLASHBACK WARNING: be ready to shut off fuel, then oxygen.
• Wear shade #4 cutting shield and leather gloves
• Point torch away from self, cylinders, others, and combustibles
• Slightly “crack open” the torch acetylene valve
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LIGHTING
• Using only a flint spark lighter, place the lighter near the tip and squeeze.
• A small, smoky flame should appear at the torch tip.
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ADJUSTING
• Open the torch acetylene valve further until the flame is bright and bushy with no smoke, but the flame is still attached closely to the tip.
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ADJUSTING
• Open the torch oxygen valve slowly until the long, white, feathery flame is replaced by sharp white cones at the tip.
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ADJUSTING
• Depress the torch cutting lever completely.
• While it is depressed, open the torch oxygen valve further as necessary to get clean, sharp, white cones.
• Blue cones indicate too much oxygen.
• Release the torch cutting lever.
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CUTTING
• Hold the torch handle in one gloved hand, rest the torch tubes on the other.
• Slide torch out to place tip centered over edge of plate, cone tips just touching the steel.
• When the steel is red hot, squeeze the cutting lever and slide the torch toward you.
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CUTTING
• Move slowly at first, then more quickly to get a clean cut.
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SHUTTING DOWN
• Shut off the torch oxygen valve quickly, then the torch acetylene valve quickly.
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SHUTTING DOWN
• Close the acetylene cylinder valve clockwise all the way.
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SHUTTING DOWN
• Open the torch acetylene valve counterclockwise.
• Watch both acetylene regulator gauges drop to zero.
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SHUTTING DOWN
• Back out the acetylene regulator adjusting handle counterclockwise until completely loose.
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SHUTTING DOWN
• Close the torch acetylene valve.
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SHUTTING DOWN
• Close the oxygen cylinder valve clockwise all the way.
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SHUTTING DOWN
• Open the torch oxygen valve counterclockwise.
• Watch both oxygen regulator gauges drop to zero.
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SHUTTING DOWN
• Back out the oxygen regulator adjusting handle counterclockwise until completely loose.
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SHUTTING DOWN
• Close the torch oxygen valve.
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SHUTTING DOWN
• Roll back hoses• hang up torch• secure oxygen
cylinder valve safety cap
• You can find out more about our welding program at http://weldinglab.mma.edu