When adjusting propane and oxygen valves, how should the oxygen valve be opened?

Opening the oxygen valve completely is essential for achieving an optimal flame when using a propane-oxygen torch. A fully opened oxygen valve allows for a maximum flow of oxygen, which is crucial for proper combustion with propane. This maximizes the temperature and efficiency of the flame, essential for processes like cutting or welding.

When the oxygen is fully opened, it ensures that there is sufficient oxygen to react with propane, creating a hotter and more stable flame necessary for effective welding techniques. An incomplete opening of the oxygen valve would restrict the amount of oxygen available, resulting in a less efficient flame that may lead to incomplete combustion or inadequate heating of the materials being worked on.

Therefore, fully opening the oxygen valve is a critical part of setting up the welding equipment to ensure the safety and effectiveness of the thermite welding process.