2. Oxy Fuel Systems Basic Setup & Use Mr. Lacey Livingston High school

3. Typical Torch System  Oxygen Cylinder  Acetylene Cylinder  Regulators  Hoses  Torch Body  Torch Head  Torch Tip Back (Welding skills)

4. Oxygen Cylinders OOxygen is very pure - 99% PPressure is 2200 psi at 70 0 HHydrostatic tested to 3300 psi FForged from a single piece of steel - no welding MMinimum of 1/4” thickness caution

5. Oxygen Cylinder Valve  Brass Construction  Double back seat - NEVER LEAVE HALF OPEN  Pop off valve - (fragile disk)  Right hand Thread Back Click for cap slide

6. K LK TSD,E,Y, U,LE QMEMBEXAD MD R Oxygen cylinder sizes: We use this size Safety precautions

7. Acetylene Cylinders  Acetone - absorbs acetylene under pressure  Temperature has an extreme affect on pressure  Let stand upright at least 20 minutes before using Learn more

8. 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

9. WK WTL WS WCL WCWQ Acetylene tank sizes Click to see explosion

10. Acetylene Cylinders  C 2 H 2 - Made from calcium carbide and water  Welded construction  Monolithic filler - Asbestos fibers, balsawood (85% porous)  Fusible plug - 212 0 F  Temperature has an extreme affect on pressure Back

11. Torch Body  single stage / dual stage (LHS METAL)

12. Needle valves  Crack to release the flow of gas  Preheat / Cutting hole pressures  Tighten fully Return to torch slide (LHS METAL)

13. Cutting Head  Preheat oxygen needle valve  Seat type / Graphite type - tightening  Body to head connection - tightening (LHS METAL) Starting a cut

14. Brazing torch assembly  No. 1 tip  Valve body  Oxygen valve  Acetylene valve (LHS METAL)

15. 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

16. Correct sequence for lighting  Crack Acetelene  Point tip away and use striker  Slowly open Oxygen  Adjust to neutral flame  Turn off Oxygen First Need more help Lighting video

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

18.  Gauges - High and Low pressure  Bonnet - weakest point  Adjusting screw - Clockwise = On (Beginners Guide)

19. Flame definitions  Carburizing Flame- Not enough O2  Neutral Flame Perfect  Oxidizing Flame- Too much O2

20. Flame types CarburizingNeutral Oxidizing Click to return (Modern Welding)

21. Cutting Tips  1 or 2 piece  sizes relate to # Drill Sizes  Hand / Wrench tight (Genstartech)

22. Tip Cleaners  Small cleaners for cleaning inside the tip. (Welding skills)

23. Protector Cap  Protects valve from being knocked off  Must be in place when Regulators are off Click to return to O2 tank (Oxnard welding)

24. Starting or restarting a cut Heat the starting point Move the oxygen hole off the edge of the plate and start the oxygen stream Resume Cutting Click to see demo

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

26. 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

27. 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

28. 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

29. Offhand Cutting Techniques  Rolling your hands “Pre-load” your wrist and forearm Roll, don’t 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 Don’t move the torch body hand during stops and starts.