Oxy Fuel Systems Basic Setup

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Oxy Fuel SystemsBasic Setup Use
Mr. Lacey Livingston High school
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Typical Torch System
Back

• Oxygen Cylinder
• Acetylene Cylinder
• Regulators
• Hoses
• Torch Body
• Torch Head
• Torch Tip

(Welding skills)
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Oxygen Cylinders
caution

• Oxygen is very pure - 99
• Pressure is 2200 psi at 700
• Hydrostatic tested to 3300 psi
• Forged from a single piece of steel - no welding
• Minimum of 1/4 thickness

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Oxygen Cylinder Valve
Back

• Brass Construction
• Double back seat - NEVER LEAVE HALF OPEN
• Pop off valve - (fragile disk)
• Right hand Thread

Click for cap slide
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Oxygen cylinder sizes
We use this size
Safety precautions
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Acetylene Cylinders
Learn more

• Acetone - absorbs acetylene under pressure
• Temperature has an extreme affect on pressure
• Let stand upright at least 20 minutes before
  using

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Acetylene Cylinder Valve

• Brass Construction
• Packed valve - OPEN 1/2 TO 3/4 TURN
• Hand wheel or tank wrench - NEVER REMOVE WRENCH
  during use
• RH (Male) or LH (Female) Thread

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Acetylene tank sizes
Click to see explosion
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Acetylene Cylinders

• C2H2 - Made from calcium carbide and water
• Welded construction
• Monolithic filler - Asbestos fibers, balsawood
  (85 porous)
• Fusible plug - 2120 F
• Temperature has an extreme affect on pressure

Back
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Torch Body

• single stage / dual stage

(LHS METAL)
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Needle valves
Return to torch slide

• Crack to release the flow of gas
• Preheat / Cutting hole pressures
• Tighten fully

(LHS METAL)
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Cutting Head

• Preheat oxygen needle valve
• Seat type / Graphite type - tightening
• Body to head connection - tightening

(LHS METAL)
Starting a cut
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Brazing torch assembly

• No. 1 tip
• Valve body
• Oxygen valve
• Acetylene valve

(LHS METAL)
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Procedures for Lighting Oxy-Acetylene Systems

• Open tanks one at a time (Oxygen wide, Acetylene
  1/2 turn)
• Adjust regulators
• Open the acetylene needle valve and light torch
• Open high pressure oxygen needle valve wide
• Adjust to a neutral flame

Click to see flames
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Correct sequence for lighting

• Crack Acetelene
• Point tip away and use striker
• Slowly open Oxygen
• Adjust to neutral flame
• Turn off Oxygen First

Lighting video
Need more help
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Regulators

• Dual stage - more accurate
• Nozzle Type - low volume
• Stem type - High Volume
• Gauges - High and Low pressure
• Single stage - less expensive
• Bonnet - weakest point
• Adjusting screw - Clockwise On

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Regulators

• Gauges - High and Low pressure
• Bonnet - weakest point
• Adjusting screw - Clockwise On

(Beginners Guide)
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Flame definitions

• Carburizing Flame- Not enough O2
• Neutral Flame Perfect
• Oxidizing Flame- Too much O2

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Flame types
Click to return
Oxidizing
Carburizing
Neutral
(Modern Welding)
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Cutting Tips

• 1 or 2 piece
• sizes relate to Drill Sizes
• Hand / Wrench tight

(Genstartech)
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Tip Cleaners

• Small cleaners for cleaning inside the tip.

(Welding skills)
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Protector Cap
Click to return to O2 tank

• Protects valve from being knocked off
• Must be in place when Regulators are off

(Oxnard welding)
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Starting or restarting a cut
Click to see demo
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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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Oxygen Safety Precautions

• Never call oxygen Air
• Never allow oxygen to come in contact with oil,
  grease, or other petroleum bases
• Never use oxygen for compressed air
• Never move cylinders without caps
• Always secure cylinders

Back
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Setup Procedures for Oxy-Acetylene Systems

• Do not move cylinders without valve protection
• Secure cylinders
• Crack Oxygen Valve
• Attach regulators and tighten
• Attach Flashback arrestors, check valves, hoses,
  check valves, torch body, torch head, and tip

Back
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Shut Down Procedure for Oxy-Acetylene Systems

• Turn off acetylene needle valve
• Turn off preheat oxygen needle valve
• Turn off tanks
• Bleed lines one at a time
• TURN ADJUSTING SCREWS OUT
• Turn off all needle valves

Back to previous slide
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Offhand Cutting Techniques

• Rolling your hands
• Pre-load your wrist and forearm
• Roll, dont slide for a smoother cut
• Sliding the torch through your fingers
• Apply pressure to torch tubes with thumb and
  index finger
• Keep other three fingers in fist
• Dont move the torch body hand during stops and
  starts.