GAS WELDING (OXYACETYLENE WELDING)

 

LESSON TOPIC:  Oxyacetylene Welding, also know as Gas Welding

TOPICS: (click on a topic below)

Steps to turning on and off the gas welding equipment

Rules and safety tips for gas welding

Properties of fire

Quiz on Gas Welding Unit

Victor Acetylene Cutting Tip Chart side 1

Victor Flow and Heating Chart side 2

 

 

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Ten steps to setup and shut down of the Oxyacetylene welder

  1. Check that connections are tight.
  2. Back regulators out - no tension.
  3. Open Acetylene cylinder half turn.
  4. Crack open, then open Oxygen cylinder all the way.
  5. Adjust Acetylene regulator to 5 to 7 psi.
  6. Adjust Oxygen regulator to 5 to 7 psi for gas welding, 20 psi for cutting.

You are now setup.  Shut down instructions are next.

Shut Down Gas Welding Equipment

  1. Shut off acetylene cylinder 1st (it is the quickets, half turn, and the flammable one)
  2. Shut off oxygen cylinder
  3. Bleed lines
  4. Back out regulator's so there is no tension

 

Gas welding Rules and Safety

  1. Wear a face shield / safety glasses at all times.
  2. Obtain permission before use.
  3. Store separately -> Oxygen and Acetylene cylinders.
  4. Chained Securely -> Equipment connected to compressed gas cylinders.
  5. Store cylinders outdoors in a well ventilated area.
  6. Keep caps on any cylinders not having regulators attached to them.
  7. Follow specific procedures for turning systems on and off (ten steps listed above).
  8. Never expose equipment to oil or grease -> Spontaneous fire possibility.
  9. Always wear leather gloves and an apron.
  10. Learn to recognize the odors of combustible fuels.
  11. Protect gas cylinder storage areas:  Lock in a chain link fence.
  12. In case other equipment catches fire, turn off the gas in the tank.
  13. Keep all equipment or cylinders that can discharge gas pointed away from everyone and clothing.
  14. Never leave clothing where it can be saturated with oxygen or fuel gasses.
  15. When connections are opened or cylinders changed, check thoroughly for leaks.
  16. Work only in areas that are free from materials that will burn.
  17. Do not bump or put pressure on equipment connected to compressed gas cylinders.
  18. Never work in an area without a fire extinguisher.
  19. Never move a cylinder without a cap.
  20. Never leave a cylinder unattended without a cap.

 

Properties of having a fire

A fire must have three things:

  1. Fuel - Fuel is a substance that will burn, such as grease, wood, paper, hair, etc.  Don't oil regulators!
  2. Oxygen - Compressed pure oxygen is extremely dangerous as it causes fires to burn much hotter.
  3. Heat - A spark, friction, or an already existing flame.