745 Welding, Cutting, and Brazing Safety

Equipment Safety

In this module we'll briefly discuss the equipment, operation steps, and guidelines for a couple of the most common types of welding processes.

Gas Welding/Cutting Equipment

Oxy-Acetylene Welding/Cutting (OAW) Equipment

Oxy-acetylene welding is the most common gas-fuel welding and cutting process used throughout all industries. It combines oxygen and acetylene gases, producing an extremely hot flame capable of melting most metals.

It’s widely used due to its versatility and portability for various welding and cutting tasks. Equipment includes: oxygen cylinder, acetylene cylinder, regulators, hoses, torch, flashback arrestors, and goggles.

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

1. Inspect equipment and connections.
2. Open cylinder valves slowly and set regulator pressures.
3. Purge hoses and ignite torch (acetylene first, then oxygen).
4. Adjust flame to neutral.
5. Perform welding task.
6. Shut off torch (oxygen first, then acetylene), purge hoses.
7. Close cylinder valves and release regulator pressures.

Safe Operation Guidelines: Comply with the following safe procedures and practices when using the equipment:

• Inspect hoses for leaks, cracks, and damage to make sure equipment is safe and works properly.
• Always secure cylinders upright and chained because if a gas cylinder falls over and the valve breaks, the cylinder can turn into a dangerous missile due to the high pressure inside.
• Ensure regulators are functional and undamaged because regulators control the flow and pressure of gases like oxygen and acetylene.
• Install flashback arrestors and check valves on torch to protect from dangerous gas-related accidents.
• Purge hoses before igniting torch to remove gases, prevent flashbacks, ensure correct mixtures, and protect equipment.
• Lighting torch: open acetylene first slightly, ignite, then introduce oxygen slowly to prevent explosions, control the flame, avoid flashbacks, and allow for smoother flame control.
• Adjust flame to neutral to avoid overheating or oxidizing metals.

• Always wear welding goggles, gloves, apron, and suitable protective clothing.
• Turn off torch correctly (close oxygen first, then acetylene), purge remaining gas to prevent flashbacks and fires, avoid pressure buildup, and protect equipment.
• Regularly check work area ventilation to stay safe from toxic fumes and gases, prevent breathing problems, and improve comfort and focus.

Knowledge Check Choose the best answer for the question.