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• For EG243 Welding:• Pressurizing• Lighting• Cutting• Shutting Down • the Airco 9500

Cutting Torch.

• Procedure, PowerPoint and pictures by Stephen Collins (scoll@mma.edu)

• 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