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Oxyfuel Welding Equipment Chapter 12. Objectives Identify the various components of an oxyfuel gas welding outfit. Describe the function of each component.

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Presentation on theme: "Oxyfuel Welding Equipment Chapter 12. Objectives Identify the various components of an oxyfuel gas welding outfit. Describe the function of each component."— Presentation transcript:

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

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5 Oxygen Supply Stored in high pressure cylinders – 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

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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

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

13 Hoses Hose colors –Red, green, and black Green and Black –Oxygen Red –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 –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 electrodes10 3/16, 7/32, 1/4 inch electrodes12 5/16, 3/8 inch electrodes14 MIG Welding (nonferrous)11 MIG Welding (ferrous)12 Atomic Hydrogen Welding10-14 TIG Welding12 Plasma Cutting14 Carbon Arc14 Torch Brazing3 or 4 Light Cutting, up to 1 inch3 or 4 Medium Cutting, up to 1 inch4 or 5 Heavy Cutting, 6 inches and over5 or 6 Gas Welding (Light) up to 1/8 inch4 or 5 Gas Welding (Medium) 1/8 to 1/2 inch5 or 6 Gas Welding (Heavy) 1/2 inch and over6 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

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