1. Oxyfuel Welding Equipment
Chapter 12

2. Objectives
Identify the various components of an oxyfuel gas welding outfit.
Describe the function of each component of an gas welding out fit.
Cite the maximum safe working pressure used for acetylene.
List all the safety equipment that should be worn and used when oxyfuel gas welding in various positions.

3. Complete Oxyfuel Outfit
Gas Supply
Regulators
Hoses
Welding Torch
Eye Protection
Striker

5. Oxygen Supply Stored in high pressure cylinders Obtained By
PSI
Obtained By
Atmosphere
Electrolysis
Oxygen-bearing pellet

6. Oxygen Cylinders Interstate Commerce Commission (ICC)
Forged in one piece
Must be at least ¼ inch thick
High carbon steel

7. Cylinder Valves Made of brass “Back-seating valve”
Never use in the partly opened position
Integrated pressure safety device
Cylinder safety cap

9. Acetylene Cylinders Acetylene is not safe above 15 PSI
Cylinders are filled with monolithic filler
85% porosity
Charged with acetone
Absorbs acetylene
Fuse plugs

10. Pressure Regulators Reduce high cylinder pressure to working pressure
Maintain a constant working pressure

12. Pressure Gauges Usually two on each regulator
One indicates bottle pressure
One indicates hose pressure

13. Hoses Hose colors Green and Black Red Red, green, and black Oxygen
Acetylene

14. Torch Types
Positive pressure type
Injector type

15. Positive Pressure Type
Mixing chamber is located inside the valve body
Requires high pressure to mix gases

16. Injector Type
Acetylene is injected into the oxygen stream using venturi action
Mixing chamber creates turbulence to further mix gases

17. Welding Tips Solid copper Two different types of tips Do not drop tips
One piece
Two piece
Do not drop tips
Do not try to remove hot tips

18. Tip Cleaners Orifice size and shape must be maintained
Splatter from base metal may contaminate tip
Tip cleaners use a round file type cleaner
Only correct size cleaners should be used
Tips should be filed off perpendicular to orifice

19. Welding Eye Protection
The shade used should be dark enough to protect the eyes from annoying glare; yet light enough to permit the welder to see his work .

20. Manual Metal Arc:
1/16, 3/32, 1/8, 5/32 inch electrodes 10
3/16, 7/32, 1/4 inch electrodes 12
5/16, 3/8 inch electrodes 14
MIG Welding (nonferrous) 11
MIG Welding (ferrous) 12
Atomic Hydrogen Welding
TIG Welding
Plasma Cutting
Carbon Arc
Torch Brazing or 4
Light Cutting, up to 1 inch 3 or 4
Medium Cutting, up to 1 inch 4 or 5
Heavy Cutting, 6 inches and over 5 or 6
Gas Welding (Light) up to 1/8 inch 4 or 5
Gas Welding (Medium) 1/8 to 1/2 inch 5 or 6
Gas Welding (Heavy) 1/2 inch and over 6 or 8

21. Other Fuel Gases Hydrogen LP gas Natural gas
Methylacetylene propadiene (MAPP)

22. Check Valves Only allows gas to flow in one direction
Can be at torch inlet regulator outlet or both

23. Flashback Arrestors Check valve Pressure-sensitive cut off valve
Stainless steel filter
Heat-sensitive check valve