Welding and Cutting for construction - PowerPoint PPT Presentation

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Welding and Cutting for construction

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  1. Welding and Cuttingfor construction

  2. Welding safety program guidelines • Person responsible • Accountability and enforcement • Job hazard assessment • Special procedures 1a

  3. Welding safety program guidelines • Engineering controls • Administrative controls • Personal protective equipment 1b

  4. Welding safety program guidelines • Equipment inspection/maintenance • "Near miss" investigation 1c

  5. Compressed gas cylinders hazards • Valve protection caps • Hoisting cylinders • Moving cylinders 2a

  6. Compressed gas cylinders hazards • Transporting by powered vehicles • Cylinders in use • Closed cylinder valve 2b

  7. Storing compressed gas cylinders • Upright position • Oxygen cylinders separated • 20 foot rule • CGA Pamphlet P-1-1965 3a

  8. Placing compressed gas cylinders • Fire prevention • Electrical protection • Valve end up • Confined space restriction 4a

  9. Treatment of compressed gas cylinders • Do not: • Mix gases in a cylinder • Refill a cylinder • Use for purposes not intended • Use damaged or defective cylinders 5a

  10. Training employees using fuel gas • Reduce the pressure via a regulator • Cracking the valve • Open slowly • Close valve/release gas 6a

  11. Cylinder leaks • Immediately discontinue use • Properly tag • Remove from the work area 7a

  12. Fuel gas and oxygen manifolds • Manifolds correctly marked • Safe, well ventilated locations • Hose connections keep free of grease and oil 8a

  13. Fuel gas and oxygen hose • Easily distinguishable from each other • Not interchangeable • Parallel sections taped together • Inspect before using 9a

  14. Fuel gas and oxygen hose • Remove defective hose from service • Test to twice the normal pressure • Keep out of passageways 9b

  15. Torches • Clean clogged torch tip openings • Inspect before using • Don’t use defective torches • Use friction lighters 10a

  16. Housekeeping • Keep free from oil or greasy substances • Avoid directing oxygen flow 11a

  17. Manual electrode holders • Specifically designed • Fully insulated 12a

  18. Welding and cutting cables • Completely insulated, flexible type • Handle maximum current requirements 13a

  19. Welding and cutting cables • Do not use damage cable • Worn cable to be protected • Connecting or splice cable 13b

  20. Training for arc welding and cutting • Remove electrodes if left unattended • Avoid electric shock • Open power supply switch 14a

  21. Training for arc welding and cutting • Report defective equipment • Provide supply circuit disconnect • Provide switch or circuit breaker 14b

  22. Five common arc-welding processes • Shielded metal (SMAW) • Gas metal (GMAW) • Gas tungsten (GTAW) • Flux cored (FCAW) • Submerged (SAW) 15a

  23. Welding and fire prevention • Move object to safe location • Move fire hazards to safe place • Confine the heat, sparks, and slag 16a

  24. Welding and fire prevention • Avoid flammable compounds • Fire extinguishing equipment 16b

  25. Fire watchers • Assign additional personnel • Instruct in the specific hazards • Firefighting equipment is used 16c

  26. Drums and containers • Keep closed if full • Move empty containers to safe area • Clean containers if necessary • Open vent during the application of heat 16d

  27. Mechanical ventilation • General mechanical ventilation systems • Local exhaust systems • Oxygen restrictions 17a

  28. Confined spaces • Use of air line respirators • Communication • Emergency rescue • Pre-planed rescue procedure 18a

  29. General welding, cutting, and heating • Absence of hazards conditions • Absence of toxic materials • No special requirements • Eye protective equipment needed 19a

  30. Preservative coatings • Testing by a competent person • Determine flammability • Remove from welding area 20a

  31. Physical hazards of welding and cutting • Ultraviolet radiation (UV) • Infrared radiation (IR) • Intense visible light 21a