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Oxyfuel Welding Equipment

Oxyfuel Welding Equipment. Chapter 12. 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.

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Oxyfuel Welding Equipment

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  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

  4. Oxygen Supply • Stored in high pressure cylinders • 2000-2640 PSI • Obtained By • Atmosphere • Electrolysis • Oxygen-bearing pellet

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

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

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

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

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

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

  11. Torch Types • Positive pressure type • Injector type

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

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

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

  15. 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

  16. 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 .

  17. 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 10-14 TIG Welding 12 Plasma Cutting 14 Carbon Arc 14 Torch Brazing 3 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

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

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

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

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