Flame cutting is to use a gas flame (the flame formed by oxygen and gas) to heat the surface of the steel plate to locally reach the combustion temperature, and then pass into a high-purity and high-speed cutting oxygen flow, causing the metal to undergo a violent combustion reaction and release heat. At the same time, the products generated by the combustion are blown away by the huge kinetic energy of the high-speed cutting oxygen flow and form cutting slots.
In flame cutting, there are three key influencing factors, namely cutting nozzle, oxygen and gas.
There are various brands and models of cutting nozzles on the market, including split and integrated ones. The structure and size of the two, the shape of the flame and the state of the cutting oxygen flow are different, and the cutting properties and efficiency are different.
In flame cutting, there are two channels of oxygen, one of which is low-pressure oxygen, which will be mixed with the gas to form a flame to heat the steel plate. The other oxygen is cutting oxygen, which not only participates in the combustion reaction, but is also the main source of power for the cutting process. At the same time, the purity and pressure of oxygen will directly affect the cutting ability and surface quality.
The type of gas and combustion characteristics also have an important impact on the flame form and cutting quality. This is mainly reflected in the mixing ratio of gas and oxygen. Different mixing ratios of oxygen and gas will form different types of flames, including three main types: oxidation flame, neutral flame and carbonization flame. Different flame types have different flame forms, and their combustion characteristics and temperature distribution are also different. Therefore, choosing a suitable flame type is also a prerequisite for ensuring high-quality cutting surfaces and cutting speed.