Oxyfuel Cutting and Welding Caged Giants

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Oxyfuel Cutting and WeldingCaged Giants

• Oxygen and Acetylene Safety, Procedures, and Uses

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Vocabulary

• Oxyfuel refers to the process of combining pure
  oxygen with a combustible fuel gas to produce a
  flame.
• Oxyfuel is used for welding, brazing, cutting,
  and heating metals
• Fuels Propane, natural gas, propylene, and
  acetylene

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Fuels

• Propane C3H supplied under positive pressure
• If you use LP gas, you have to have special hoses
  and cutting tips.

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Fuels

• Propylene C3H6 has been used for about 30 years
• It is stable in both liquid and gas states,
  economical, produces little slag, a high heat
  value, and no withdrawl limit

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Fuels

• Acetylene C2H2 is the most widely used fuel for
  welding and cutting apps.
• It is LESS stable and more expensive than other
  fuels
• Performs most functions well

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Acetylene Facts

• Colorless
• A very distinct odor
• Highly Combustible
• Cylinder ranges from 60 to 300 cubic feet
• Cylinder contains a porous substance saturated
  with liquid acetone

• Acetylene is pumped into cylinder
• It is NOT under high pressure
• Full cylinder is pressurized to approx 250psi
• MAY NOT BE WITHDRAWN at a rate higher than 15 psi

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Aceytlene Bottle
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Oxygen Facts

• Colorless, odorless, tasteless, and is heavier
  than air.
• Makes up about 20 of atmosphere
• Oxygen itself will not burn, but when mixed . . .
  POOSH!
• Compress at about 1800 to 2400 psi
• Cylinders range from 80 to 244 cubic feet.

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Oxygen Bottle
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Functions of Oxyfuel Heat

• Cuts metal at 1400-1800 Degrees F and oxides and
  blows slag away with a stream of pure oxygen.
• Welding fuses two pieces of metal together by
  heating them to a melting point. Can be done
  with or without a welding rod

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Brazing

• Joining of metals by adding bronze filler

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Brazing
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Soldering

• Soft and hard solder (lead and silver alloys) are
  the filler materials

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Common Cutting Rig

• 1. Cylinders
• 2. Regulators
• 3. Hoses
• 4. Safety Check Valves
• 5. Torch Handle
• 6. Cutting attachment
• 7. Tip Cleaner
• 8. Lighter
• 9. Wire Brush

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Cutting
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Torch Head
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Torch Flames
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Regulators
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Regulator
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Safety Disc
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Ruptured Disc
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Safety Pop-off Valve
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(No Transcript)
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Bottle Caps
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All This Information Stops the Following Slides
from Happening . . .
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Bottle Explosion

• This incident happened on Monday the 29th of
  September 2003. A fitter with a work van left an
  E size Oxygen and Acetylene cylinder on the back
  seat of a Toyota dual cab over the weekend. The
  Acetylene cylinder valve was not fully closed and
  a leak occurred.
• Over the weekend the Acetylene accumulated in the
  van. On Monday morning the fitter approached the
  van and opened the door, a large explosion took
  place. The ignition may have been caused by
  either the internal light circuitry, the
  automatic door control, mobile phone which was on
  the front seat of the van, or lighting a
  cigarette. The fitter was also a smoker. He has
  damage to his ear drums and facial damage. As you
  can see by the attached photo he was very lucky.
  Don't let safety be something you learn by
  accident.

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Bottle set caught on Fire
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Twisted Bottle
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The Next Couple of Slides are over Safety
Precautions
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1.

• Keep Oil and Grease away from all parts of the
  welding and cutting apparatus.

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2.

• Secure the cylinders in an upright position so
  they cannot be overturned.

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3.

• Face the regulator gauges up toward the ceiling,
  making it impossible to stand in front of them.

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4.

• Store the use oxyfuel units in well ventilated
  areas adequately separated from other activities.

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5.

• Acetylene pressure in the lines should NEVER
  exceed 15 psi.

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6.

• Open the acetylene cylinder ¼ to ½ turns

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7.

• Use an approved spark lighter to light the torch.
  NEVER use matches or a cigarette lighter.

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8.

• NEVER use oxygen to operate pneumatic tools, blow
  out lines, inflate tires, or dust off clothing

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9.

• Never hang clothing on cylinders, running the
  risk of saturating them with oxygen and acetylene

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10.

• Do NOT convert acetylene regulator to an oxygen
  regulator or vice versa.

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11.

• Slowly open the oxygen cylinder valve to prevent
  a sudden surge in pressure.

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12.

• Release or lossen the regulator adjusting screw
  before opening a cylinder valve.

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13.

• Do not walk with a lighted torch or lay down a
  lighted torch.

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14.

• Blow out hoses before attaching the torch.

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15.

• Repair hoses with proper hose splices, not
  friction tape. NEVER use a leaking hose.

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16.

• Test for leaks with soap and water, not matches.

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17.

• If valves on cylinders are faulty or too tight,
  notify the supplier undue fore would be
  dangerous.

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18.

• Keep a fire extinguisher handy at all times.

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19.

• Dress properly and wear eye protection.

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20.

• Dress properly and wear eye protection

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21.

• Prevent heat and sparks from getting into
  cylinders and hoses.

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22.

• Do not strike an arc on a cylinder or hit a
  cylinder with a metal object.

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23.

• Never use a cylinder as a ground in an electrical
  circuit.

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24.

• Never guess get the correct information from a
  qualified person

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The End

• Information taken from IMS curriculum 8609-A