1. Oxy Fuel Cutting Systems Basic 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. Oxygen cylinder sizes:K LK T S
D,E,Y,U,LE Q ME
MBE
XAD MD R

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 Oxygen = Green
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 Head Welding 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. Starting or restarting a cut
Heat the starting point
Resume Cutting
Move the oxygen hole off the edge of the plate and start the oxygen stream

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. Terms and 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