1. Oxy Fuel Welding 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
Forged from a single piece of steel - no welding minimum ¼” thick
Atmosphere
21% oxygen
78% Nitrogen
1% other (carbon dioxide, argon, helium, water vapor)

4. Oxygen Cylinder Safety
Open valve all the way.
Transport with safety cap on
Tanks should always be safety chained
Torpedo

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

6. Acetylene - C2H2 C2H2 - Made from calcium carbide and water
Cylinders are lined with Asbestos fibers
Cylinders are then filled with Acetylene gas and Acetone
The acetone absorbs the acetylene and slowly releases it as it is used
Allow tank to settle for 20 minutes
Apply safety caps and chains
Valve: ¼ to ½ turns
15 PSI Max

7. Acetylene Cylinder sizes:WK
WTL WS
WCL WC WQ

8. Regulators Regulator- fine tune the working pressure Gauges –
Tank pressure (close)
Working pressure
Acetylene regulators have LH (reverse) threads
Always stand to the side
Crack valve during tank replacement

9. Backflash Arrestor Check valve Prevents burnback Torch / Manifold
Regulator / torch

10. Hoses Acetylene = Red LH (Reverse) thread Oxygen = Green RH Thread
New Hoses have talc inside - Blow out before connecting to torch
Determining & pinpoint leaks
Keep clean, never oil

11. Back Flash Reverse flow of combusting gas into cylinder
Typically caused by improper working pressures or torch distance
Crackle, stub, whistle
IMIDIATELY kill main acetylene valve\
Tank could explode
Video

12. Torch Body Valves control gas flow
Final flame adjustment controlled here

13. Setup Procedures Confirm regulator screw positions (out)
Stand to the side of regulators
Open tanks one at a time
(Acetylene: 1/4 turn, Oxygen: Full)
Set acetylene working pressure
Welding: 3-5 psi, Cutting: 5-7 psi
Set Oxygen
Welding: 3-5 psi, Cutting: psi

14. Setup Video (5 min)

15. Lighting Procedure Crack acetylene valve Light with friction lighter
(do not light with anything else!!!)
Adjust acetylene (little smoke)
Slowly adjust oxygen for neutral flame
Note: cutting pressure is set with trigger pulled
Flame temp is about 5500°F
Steel melts at 2800°F

16. Welding Flame Types
Carburizing Flame
Neutral Flame
Oxidizing Flame

17. Shut Down Procedure Turn off acetylene torch valve
Turn off oxygen torch valve
Shut down tanks
Bleed lines
Shut down regulators

18. Oxy-Acetylene Welding (no filler)
Hold blue cone about 1/16-1/8” from metal at a 15-45° angle
Move tip in small circles until a molten puddle is formed
Slowly push the puddle across the metal

19. Oxy-Acetylene Welding (With Filler R-45)
Filler material helps fill the joint
Added to puddle on backstroke
Heat metal until puddle is formed
Position 20* angle from base metal
90* torch relationship
Metal will melt off of filler rod and be drawn into puddle
Slowly push the puddle across the work piece

20. Basic Setup

21. Weld Quality
Torch High
Torch Low
Torch Slow
Torch Fast OK

22. Welding Troubleshooting

23. Tip Cleaning Carbon & slag deposits may clog the tip.
prevents proper lighting
Improper mixture causes erratic flame
poor performance
Another indication of a clogged tip is the presence of popping sounds.
Cleaning your torch tips regularly.
Start with a smaller tip and work to size!

24. OFW Welding Tip Information

25. OFB Brazing Tip Information

26. Soldering Tip Information

27. OFC Cutting Tip Information