oxyacetyleen

Oxyacetyleen, also spelled oxy-acetylene, is a fuel gas mixture used for welding, cutting and heating metals. It combines acetylene (C2H2) and oxygen (O2), supplied from separate cylinders through a specialized torch. Acetylene is typically stored dissolved under pressure in a porous cylinder with a solvent such as acetone to stabilize the gas, while oxygen is stored as a separate pressurized gas.

In a welding or cutting torch, the gases are mixed and ignited to produce a flame whose characteristics depend on the gas ratio. A neutral flame, suitable for welding, is achieved near a balanced ratio of acetylene and oxygen; adjusting the ratio yields oxidizing or carburizing flames. The oxygen–acetylene flame is among the hottest commercially used flames, with temperatures commonly exceeding 3,000 °C.

Applications include welding, brazing, cutting and heating of metal components, as well as glassworking and soldering in some contexts. The combination offers high flame temperature and relatively rapid heating, and it remains popular for portable work and field applications where electrical power is unavailable.

Safety and handling are central considerations. Oxyacetylene is highly flammable, and the gas mixture can be explosive under high pressure. Cylinders should be stored upright and secured, away from heat sources. Use of proper regulators, hoses, and flashback arrestors is important, along with good ventilation and avoidance of oils or greases near equipment. Trained operation is recommended to prevent leaks, fires or explosions.

Historically, the development of oxyacetylene welding and cutting in the early 20th century revolutionized metalworking by providing a portable, high-temperature heat source. The term refers to both the gas mixture and the equipment used to deliver it.