How to adjust gas cutting flame

1. Turn on the gas first, turn down the welding torch, then open the big air valve (red hose connector, lower part of the welding torch), and then open the oxygen valve (black hose connector, upper part of the welding torch). When the flames converge into a concentrated flame, you can start cutting. If the flame is not concentrated, the temperature can not meet the requirements, and the edge of the cut steel plate is irregular, don't adjust the oxygen too much, and the fire will go out.

2. Turn to neutral flame, preheat the steel plate, and start cutting oxygen as soon as it begins to melt.

3. Pay attention to the switch sequence

In the process of gas cutting, the gas valve, oxygen valve and power supply must be switched in turn to ensure the normal order. When you start the machine, you should ignite it first to prevent combustible gas from leaking. After cutting, the oxygen valve should be closed first, then the gas valve should be closed, and finally the power supply should be turned off to minimize the possible danger.

4. Pay attention to determine the size of preheating flame according to the thickness of steel plate.

5. It is very important to control the air valve.

Gas cutting mainly uses the high-temperature combustion of gas to cut the partition, and the cutting quality can be guaranteed through the adjustment and control of gas valves. When in use, you can simply test whether the gas is normal with your fingers. After opening the gas valve and oxygen valve, feel whether there is gas inhalation on your fingers, and judge whether the gas is available by experience.

Gas cutting refers to the use of gas flame to preheat the cut metal to the ignition point, so that it burns violently in pure oxygen flow, forming slag and releasing a lot of heat. Under the blowing force of hyperbaric oxygen, the oxide slag is blown away: the released heat further preheats the next layer of metal to reach the melting point. The gas cutting process of metal is a continuous process of preheating, combustion and slag blowing, and its essence is the process of metal burning in pure oxygen, not melting.

References:

Baidu encyclopedia-gas cutting