oxygen
Cutting and welding of metals

The use of oxygen in the mechanical industry for metal welding and cutting can greatly improve work efficiency. Hydrogen oxygen flame and oxygen acetylene flame are used in mechanical factories for cutting and welding plates and containers. Oxygen propane flame cutting can improve the smoothness of the cutting surface. Replaced the casting, forging, milling, and creation of some parts. Oxygen, as a combustion enhancer, is used in conjunction with flammable gases such as acetylene and propane to achieve the purpose of welding and cutting metals. It is widely used in various industries, especially in mechanical enterprises, and is also convenient for cutting. It is the preferred cutting method.

nitrogen
1. Metal heat treatment
Nitrogen is a neutral gas. In the non activated state, nitrogen can be used for maintenance heating to prevent oxidation and decarburization of steel, and is therefore widely used in heat treatment technologies such as bright quenching, bright annealing, and bright tempering. During vacuum heat treatment, nitrogen is often used as a cooling medium; When nitrogen is filled and pressurized for oil quenching, nitrogen can not only maintain the electric heating elements of the vacuum furnace, but also improve the quenching hardness of steel parts by adjusting the nitrogen pressure. Under certain voltage and low vacuum conditions, nitrogen will ionize and can be subjected to ion nitriding and ion nitrogen carbon co nitriding. During carburizing and nitriding, nitrogen gas is commonly used for furnace blowing and exhaust, and the furnace door is sealed with an air curtain for oxidation prevention and cooling after carburizing; When gas and power are cut off, sending nitrogen into the furnace can prevent gas explosion and ensure safe operation. Nitrogen based atmosphere treatment has the advantages of energy saving, abundant gas source, safety and economy, and wide adaptability. It can be stably used in various heat treatment processes such as annealing, quenching, carburizing, nitriding, etc. In order to produce high-quality Euro coins, it is necessary to apply extra heat treatment to the steel alloy coin stamping dies used in the production technology.
2. Low temperature treatment of metals
Liquid nitrogen can quickly transform the remaining austenite arrangement into a strong, dense, and stable martensite arrangement, which can improve the durability of metal parts and cutting tools by 0.5-1.5 degrees. Widely used in rolling mills, train wheels, cutting tools, and other fields. In addition, using low-temperature treatment for parts such as molds, cams, gears, etc. can improve their lifespan and can also be used for materials such as stainless steel, hard alloys, non-ferrous metals, and even plastic glass.
3. Cut open
High purity nitrogen, high-purity helium, and high-purity carbon dioxide are used together as laser gases for laser cutting.
4. Welding processing
Used as maintenance gas for aluminum products, aluminum profile processing, aluminum foil rolling, etc., used as maintenance gas for reflow soldering and wave soldering matching, and for sleeve welding quality.
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