Maricopa Community Colleges  SUN140   19972-20046 
Official Course Description: MCCCD Approval: 10/22/96
SUN140 19972-20046 LEC 2 Credit(s) 2 Period(s)
Oxyfuel Cutting
Metal cutting with an oxyfuel torch including safety, cutting equipment, set up, torch lighting, flame adjustment, shut down, disassembly, cylinder changing and proper cutting procedures. Includes metal cutting exercise. Prerequisites: (Indentured status with the Arizona Builders Alliance and ABC119) or permission of the apprenticeship coordinator.
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MCCCD Official Course Competencies:
 
SUN140   19972-20046 Oxyfuel Cutting
1. Explain safety procedures when using oxyfuel cutting equipment. (I)
2. Identify and explain the operation of components of oxyfuel cutting equipment. (II)
3. Set up oxyfuel equipment. (III)
4. Identify and explain the significance of specific oxyfuel flames. (IV)
5. Explain "backfire" and "flashbacks". (V)
6. Light and adjust an oxyfuel torch. (VI)
7. Shut down oxyfuel cutting equipment. (VII)
8. Disassemble oxyfuel equipment. (VIII)
9. Demonstrate the proper procedures to safely change empty cylinders. (IX)
10. Demonstrate proper housekeeping procedures. (X)
11. Perform specified oxyfuel cutting. (XI)
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MCCCD Official Course Outline:
 
SUN140   19972-20046 Oxyfuel Cutting
    I. Safety Procedures
        A. Personal protective equipment
          1. Cutting goggles
          2. Safety glasses
          3. Ear plugs
          4. Protective clothing
          5. Leather welding gloves
          6. Hightop leather boots
        B. Ventilation
          1. Toxic fumes
          2. Respirator
        C. Area safety
          1. Flammable material
          2. Fire extinguisher
        D. Hot work permits and fire watches
        E. Cutting containers
          1. Hazardous materials
          2. MSDS (material safety data sheets)
        F. Oxygen
        G. Housekeeping
      II. Oxyfuel Cutting Equipment
          A. Oxygen
            1. Combustion
            2. Cylinders
          B. Acetylene
            1. Pressure limitations
            2. Cylinders
          C. Liquefied fuel gases
            1. Methylacetylene propadiene (MAPP)
            2. Propylene
            3. Natural gas
            4. Propane
            5. Cylinders
          D. Regulators
            1. Single-stage
            2. Two-stage
            3. Check valves and flash arrestors
          E. Hoses
          F. Cutting torches
            1. One-piece
            2. Combination
          G. Cutting torch tips
            1. Acetylene
            2. Liquefied fuel gases
            3. Special purpose
            4. Cleaners and drills
          H. Friction lighters
          I. Cylinder carts
        III. Setting Up Oxyfuel Equipment
            A. Transport and secure cylinders
            B. Crack cylinder valves
            C. Attach regulators
            D. Install check valves
            E. Connect hoses to regulators
            F. Attach hoses to the torch
            G. Install cutting tip
            H. Close torch valves and release regulator adjusting screws
            I. Open cylinder valves
            J. Adjust the working pressure
            K. Test for leaks
          IV. Oxyfuel Flames
              A. Neutral
              B. Carburizing
              C. Oxidizing
            V. Backfire and Flashbacks
                A. Backfire
                  1. Improper operating pressures
                  2. Loose torch tip
                  3. Dirt in torch tip seat
                  4. Worn seat
                B. Flashback
                  1. Equipment failure
                  2. Overheated torch tip
                  3. Slag/spatter sticking to torch tip
              VI. Lighting Oxyfuel Torch
                  A. Select and attach tip
                  B. Don goggles and gloves
                  C. Open fuel gas needle valve
                  D. Light with friction lighter
                  E. Adjust torch fuel gas flame
                  F. Turn on oxygen and adjust flame
                  G. Shutting off torch
                    1. Close fuel gas valve
                    2. Close oxygen valve
                VII. Shutting Down Oxyfuel Cutting Equipment
                    A. Close fuel and oxygen cylinder valves
                    B. Open fuel gas torch valve
                    C. Back out fuel gas regulator adjusting screw
                    D. Close fuel gas torch valve
                    E. Open oxygen torch valve
                    F. Back out oxygen regulator adjusting screw
                    G. Close oxygen torch valve
                    H. Coil hose and secure torch
                  VIII. Disassembling Oxyfuel Equipment
                      A. Check equipment status (shutdown)
                      B. Remove hoses from torch and regulators
                      C. Remove both regulators
                      D. Replace caps on cylinders
                      E. Store cylinders
                    IX. Changing Cylinders
                        A. Check equipment status (shutdown)
                        B. Remove regulator and replace cap
                        C. Transport to storage area
                        D. Mark cylinder as "empty"
                        E. Place in proper storage section
                      X. Housekeeping Procedures
                          A. Cleanup scraps
                          B. Sweep work area
                          C. Properly store cylinders and equipment
                          D. Check and dispose of cut metals and slag
                        XI. Cutting Procedures
                            A. Inspecting the cut
                              1. Good cuts
                              2. Causes of bad cuts
                            B. Preparing to cut
                              1. Clean metal
                              2. Mark lines
                              3. Select correct cutting tip
                              4. Light torch
                            C. Cutting thin steel
                            D. Cutting thick steel
                            E. Piercing a steel plate
                            F. Cutting bevels
                            G. Washing (bolt and rivet removal)
                            H. Gouging
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