How far should the oxygen cylinder valve be opened for welding and cutting?

For welding and cutting, the oxygen cylinder valve should be opened all the way. This practice ensures that the maximum amount of gas flows out of the cylinder, allowing for optimal performance when using oxy-fuel equipment. Oxygen is crucial because it supports the combustion of the fuel gas, and having a full opening ensures a consistent and stable flame for the welding or cutting process.

Additionally, opening the valve fully helps prevent the risk of back pressure that could occur if the valve is partially opened, which can restrict gas flow and create unsafe conditions. This full opening allows for safe and efficient operation during welding processes, ensuring that the necessary oxygen levels are available for the reaction with the fuel gas.

It's essential to remember that proper handling and use of gas cylinders, including opening the valves fully, is crucial for safety and effective welding and cutting.