745 Welding, Cutting, and Brazing Safety

Gas Welding/Cutting Equipment

Oxy-Propane (LPG) Welding/Cutting Equipment

Oxy-propane welding uses propane gas combined with oxygen, producing a moderately high-temperature flame. While oxy-propane setups are commonly employed for cutting, brazing, and heating applications, they are not typically used for fusion welding due to the flame's lower temperature compared to oxy-acetylene systems.​

Equipment includes: Propane cylinder, oxygen cylinder, propane-compatible regulator, torch, hoses, and goggles.

Operation Steps: The following is a brief list of steps to safely operate the equipment:

1. Inspect Equipment
   • Check cylinders, regulators, hoses, torch, and tips for leaks or damage.
   • Ensure cylinders are secured upright.
2. Set Up Gas Supply
   • Open propane cylinder valve slowly.
   • Adjust propane regulator to desired pressure.
   • Open oxygen cylinder valve slowly (fully open).
   • Adjust oxygen regulator to desired pressure.
3. Purge Hoses
   • Open propane torch valve slightly to purge line, then close.
   • Open oxygen torch valve slightly to purge line, then close.
4. Lighting the Torch
   • Open propane valve slightly on the torch.
   • Use a striker (not a lighter) to ignite propane.
   • Slowly open oxygen valve and adjust the flame to the desired setting.
5. Perform Welding/Cutting/Heating
   • Position the torch properly for the task.
   • Maintain proper torch angle and distance for effective heat and control.

Safe Operation Guidelines: Oxy-Propane (LPG) welding and cutting involve handling flammable gases, so following safety guidelines is important to prevent accidents. The list below provides key practices for safe operation:

• Inspect propane cylinders for leaks using soap-water tests, never flame. Soap-water tests can safely show bubbles where gas may be leaking, helping prevent fire or explosion risks.
• Use appropriate hoses rated for propane gas. Only hoses designed for propane can handle the pressure and chemical properties of the gas without degrading or leaking.
• Ensure adequate ventilation and avoid propane build-up at floor-level. Since propane is heavier than air, it can collect near the floor and create a fire hazard if not properly ventilated.
• Use regulators compatible with propane cylinders. Proper regulators help control gas flow and pressure safely, reducing the chance of hose blowouts or leaks.
• Wear flame-retardant apparel and goggles. Protective clothing and goggles shield workers from sparks, heat, and flying debris during welding or cutting operations.

Knowledge Check Choose the best answer for the question.