Oxy Fuel Welding Basic Setup

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Oxy Fuel WeldingBasic Setup Use

• By Jeremy Hodkiewicz

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Typical Torch System

• Oxygen Cylinder
• Acetylene Cylinder
• Method of Securing the cylinders
• Caps
• Regulators
• Backflash arrestors
• Hoses
• Torch Body
• Torch Head
• Torch Tip
• Clothing and Eye/Face Protection

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Oxygen Cylinders

• Oxygen is very pure - 99
• Pressure is about 2200 psi
• Forged from a single piece of steel - no welding
  minimum ¼ thick
• Atmoshere
• 21 oxygen
• 78 Nitrogen
• 1 other (carbon dioxide, argon, helium, water
  vapor)

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Oxygen Cylinder Safety

• Valve is a back-seating valve
• Always open all the way!!!
• Always transport with safety cap on
• Tanks should always be safety chained
• Should valve be broken off tank will become a
  torpedo that is capable of breaking through a
  concrete wall!!!

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Oxygen cylinder sizes
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Acetylene Cylinders

• C2H2 - Made from calcium carbide and water
• Cylinders are filled with monolithic filter
  material
• 85 porous (Asbestos fibers, balsawood)
• Cylinders are then filled with Acetylene gas and
  Acetone
• The acetone absorbs the acetylene and slowly
  releases it as it is used
• Let stand upright at least 20 minutes before
  using
• Cylinder safety must be safety chained
• Safety cap must be on when changing tanks.
• Only open valve ¼ to ½ turns
• More than 15 PSI Acetylene is very explosive

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Regulators

• Gauges
• Tank pressure
• Working pressure
• Regulator- adjusts the working pressure

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Hoses

• Acetylene Red
• Notch around nut means LH thread
• Oxygen Green
• RH Thread
• New Hoses have talc inside - Blow out before
  connecting to torch

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Backflash Arrestor

• Torch / Manifold
• Regulator / torch

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Torch Body

• Valves control gas flow
• Final flame adjustment controlled here

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Setup Procedures

• Hooking up new cylinder
• Place new cylinder in rack and hook up safety
  chain
• Remove safety cap
• Crack valve open to clean dirt out of valve
• Hook up regulator (use proper tools)
• Now see adjustment procedure

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Setup Procedures

• Make sure regulator ADJUSTING SCREW IS TURNED OUT
• Stand to the side of the adjusting screw
• Open tanks one at a time (Oxygen wide, Acetylene
  1/2 turn)
• Turn acetylene valve on torch open one turn and
  turn regulator screw in until gauge reads
  (3-5psi)
• Turn oxygen valve on torch open one and turn
  regulator screw in until gauge reads (10 psi)

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Lighting Procedure

• Open acetylene valve ½ turn
• Light torch with sparker
• (do not light with anything else!!!)
• Adjust acetylene to proper flame
• Slowly turn on oxygen until a neutral flame is
  obtained
• Flame temp is about 5500F
• Steel melts at 2800F

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Welding Flame Types
Carburizing Flame
Neutral Flame
Oxidizing Flame
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Shut Down Procedure

• Turn off acetylene torch valve
• Turn off oxygen torch valve
• Turn off tank valves
• Bleed lines one at a time
• TURN ADJUSTING SCREWS OUT

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Oxy-Acetylene Welding

• Hold blue cone about 1/16-1/8 from metal at a
  15-45 angle
• Move tip in small circles until a molten puddle
  is formed
• Slowly push the puddle across the metal

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Oxy-Acetylene Welding (With Filler Rod)

• Heat metal until puddle is formed
• Then hold filler rod about 3/8 from flame
• Metal will melt off of filler rod and be drawn
  into puddle
• Slowly push the puddle across the work piece

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Weld Quality
Torch High
Torch Low
Torch Slow
Torch Fast
OK
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Welding Troubleshooting
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Safety

• Backflash (will make a hissing noise)
• Turn Oxygen off first
• Watch where you point your flame (flame temp is
  5500F)
• Dont blow molten metal toward another person
• Dont melt the hoses
• Dont drop metal on hoses
• Dont let hoses lay on hot metal
• Only light torch with sparker

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OFW Welding Tip Information
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OFB Brazing Tip Information
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Air-Fuel Soldering Tip Information
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OFC Cutting Tip Information