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Oxy Fuel Cutting Systems Basic Setup & Use Tim Turner.

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Presentation on theme: "Oxy Fuel Cutting Systems Basic Setup & Use Tim Turner."— Presentation transcript:

1 Oxy Fuel Cutting Systems Basic Setup & Use Tim Turner

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

3 Oxygen Cylinders n Oxygen is very pure - 99% n Pressure is about 2200 psi at 70 0 F n Hydrostatic tested to 3300 psi n Forged from a single piece of steel - no welding n Minimum of 1/4” thickness n Annealed periodically n Stored away from combustibles – 5’ high wall – 1/2 hour fire rating

4 K LK TSD,E,Y, U,LE QMEMBEXAD MD R Oxygen cylinder sizes:

5 Liquid Oxygen is stored in a dewer flask

6 Acetylene Cylinders n Acetone - absorbs acetylene under pressure n Consumption rate = 1/7 content per hour n Fusible plug F n Temperature has an extreme affect on pressure n Let stand upright at least 20 minutes before using n Protected valve or cylinder cap n Stored away from oxygen and combustibles – 5’ high wall – 1/2 hour fire rating

7 WK WTL WS WCL WCWQ

8 Acetylene Cylinders n C 2 H 2 - Made from calcium carbide and water n Welded construction n Monolithic filler - Asbestos fibers, balsawood (85% porus) n Acetone - absorbs acetylene under pressure n Fusible plug F n Consumption rate = 1/7 content per hour n Temperature has an extreme affect on pressure n Let stand 20 minutes before using n Protected valve or cylinder cap n Sold by cubic feet - determined by weight of the cylinders

9 Oxygen Cylinder Valve n Brass Construction n Double back seat - NEVER LEAVE HALF OPEN n Pop off valve - (fragile disk) n Right hand Thread

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

11 Manifold Systems n Increased Efficiency n more stations n no downtime

12 Parts: n Cylinders n Hoses - Brass or braided n Check valves or hand valves n Flashback Arrestors - OSHA n Regulators n Main valves

13 Procedure for changing tanks: n Continuous supply of gasses n Do not allow empties to be pressurized n Valves and/or checkvalves n Never unsecure cylinders without protective caps n Check for Leaks n MT - DATE

14 Regulators n Gauges - High and Low pressure n Bonnet - weakest point n Adjusting screw - Clockwise = On

15 n Single stage - less expensive n Dual stage - more accurate - lump on back psi n Nozzle Type - low volume n Stem type - High Volume n Gauges - High and Low pressure - bourbon tube n Bonnet - weakest point n Adjusting screw - Clockwise = On Regulators

16 Protector Cap n Protects valve from being knocked off n Must be in place when Regulators are off

17 Backflash Arrestor n Torch / Manifold n Regulator / torch

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

19 Needle valves n What each does n Preheat / Cutting hole pressures n Tightening

20 Torch Body n single stage / dual stage

21 Cutting Head n Preheat oxygen needle valve n Seat type / Graphite type - tightening n Body to head connection - tightening n Oxygen lever - regulator setting, #1 needle valve setting

22 Cutting Tips n 1 or 2 piece n sizes relate to # Drill Sizes n Hand / Wrench tight Rosebud

23 Tip Cleaners

24 Acetylene safety Precautions n Never call acetylene “gas” n Extremely explosive with air or oxygen n Leave wrench on tank

25 Oxygen Safety Precautions n Never call oxygen “Air” n Never allow oxygen to come in contact with oil, grease, or other petroleum bases n Never use oxygen for compressed air n Never move cylinders without caps n Always secure cylinders

26 Setup Procedures for Oxy- Acetylene Systems n Do not move cylinders without valve protection n Secure cylinders n Inspect threads n “Crack” Oxygen Valve n Attach regulators and tighten n Blow talc from new hoses n Attach Flashback arrestors, check valves, hoses, check valves, torch body, torch head, and tip n Properly pressurize torch and check for leaks

27 Procedures for Lighting Oxy- Acetylene Systems n SCREW ADJUSTING SCREW OUT n Stand to the side of the adjusting screw n Open tanks one at a time (Oxygen wide, Acetylene 1/2 turn) n Adjust regulators n Bleed lines one at a time n Fine adjustments made while bleeding the hoses n Open the acetylene needle valve and light torch n Open high pressure oxygen needle valve wide n Adjust to a neutral flame

28 Shut Down Procedure for Oxy- Acetylene Systems n Turn off acetylene needle valve n Turn off preheat oxygen needle valve n Turn off tanks n Bleed lines one at a time n TURN ADJUSTING SCREWS OUT n Turn off all needle valves

29 Flame types CarborizingNeutral Oxidizing

30 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

31 Offhand Cutting Techniques n Rolling your hands – “Pre-load” your wrist and forearm – Roll, don’t slide for a smoother cut n 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.

32 Beveling Angles n Slide the torch through your fingers toward you. n Only move the hand nearest the flame when continuing the cut. n Keep your other three fingers in your fist. This will keep your hands cooler and allow you to make a better cut.

33 Safety n Backflash – Turn Oxygen off first n Watch where you cut – Don’t blow molten metal toward another person – Don’t melt the hoses – Don’t drop metal on hoses – Don’t let hoses lay on hot metal

34 Headgear Assembly – Forehead pad – Proper adjustment – How to assemble – How lenses go in – Cleaning different types of lenses – Autochange hoods – Shade numbers for various things – Cracked or broken hoods – Hood designs (pipeliner, short, sock, brazing shield, handheld).


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