Oxy Fuel Cutting Systems Basic Setup & Use

1. Oxy Fuel Cutting SystemsBasic Setup & Use

2. 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

3. Oxygen Cylinders • Oxygen is very pure - 99% • Pressure is about 2200 psi at 700 F • Forged from a single piece of steel - no welding • Minimum of 1/4” thickness • Stored away from combustibles

4. T K LK S D,E,Y,U,LE Q ME MBE XAD MD R Oxygen cylinder sizes:

5. Acetylene Cylinders • Acetone - absorbs acetylene under pressure • Temperature has an extreme affect on pressure • Protected valve or cylinder cap • Stored away from oxygen and combustibles

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

7. 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

8. Manifold Systems • Increased Efficiency • more stations • no downtime

9. Parts: • Cylinders • Hoses - Brass or braided • Check valves or hand valves • Flashback Arrestors - OSHA • Regulators • Main valves

10. Regulators • Each regulator has two gauges mounted on a single manifold, one indicates cylinder pressure and the other indicates working pressure for the torch

11. Pressure Regulating Valves • Each regulator has an adjusting screw so pressure to the torch can be quickly controlled by turning the screw righty-tighty increases pressure, left-loosey decreases pressure

12. Protector Cap • Protects valve from being knocked off • Must be in place when Regulators are off

13. Backflash Arrestor • Torch / Manifold • Regulator / torch

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

15. Needle valves Preheat / Cutting hole pressures

16. Torch Body • Torch body is the part of the torch that is held, it contains two needle valves to control flow of gas • single stage / dual stage

17. Cutting HeadWelding head contains mixer, mixing throat, and the welding tip

18. Cutting Tips • 1 or 2 piece Rosebud FOR HEATING

19. Acetylene safety Precautions • Never call acetylene “gas” • Extremely explosive with air or oxygen • Leave wrench on tank

20. 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

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

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

23. 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

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

25. 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.

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

27. Termsand Definitions • Penetration: Distance from the original surface of the base metal to that depth at which fusion stops. • Base Metal: Metal to be welded • Fusion Welding: process that joins metals by heating them to a melting point and allowing them to fuse or flow together.

28. Backfire: A short pop of the torch flame followed by extinguishing of the flame or continued burning of the gases. • Preheating: Heating prior to a welding or cutting operation • Flashback: when the torch flame moves into or beyond the mixing chamber. • Tack Weld: A short weld used to hold workpieces together

29. Safety • 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 • Release adjusting screw on regulators before opening valves

30. Stand on the opposite side of the regulator when opening a valve • Open cylinder valve slowly, oxygen first all the way open and acetylene just a quarter of a turn • Do not use or compress acetylene at pressure higher than 15 psi. • Light acetylene first, shut it off first • Never use oil on regulators or any equipment

31. Do not use oxygen as a substitute for compressed air • Keep heat, flames and sparks away from combustibles. • Keep hoses out of sparks or spatter to prevent leaks • Never use Leather Gloves to pick up metal; use pliers • Wear welding goggles or a face shield with a lens no. 4-6. • Never wear synthetic clothing; wear cotton.

32. BACK TO OXYFUEL EQUIPMENT