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An oxyacetylene torch is a tool that uses a mixture of oxygen and acetylene gases to produce a high-temperature flame. This flame is commonly used for welding, cutting, brazing, and heating metals. The torch consists of a handle with control valves for each gas, a mixing chamber where the gases combine, and a nozzle that directs the flame.

To operate the torch, acetylene is first ignited, producing a smoky, yellow flame. Then, oxygen is gradually introduced, which sharpens and intensifies the flame. The resulting flame can reach temperatures exceeding 3,000 degrees Celsius (5,432 degrees Fahrenheit), making it capable of melting most common metals. The specific flame characteristics, such as its temperature and oxidizing or reducing properties, can be adjusted by altering the ratio of oxygen to acetylene.

Oxyacetylene welding involves melting the edges of two metal pieces and allowing them to fuse together as they cool, sometimes with the addition of a filler rod. Oxyacetylene cutting works by heating the metal to its ignition temperature and then using a high-pressure stream of pure oxygen to oxidize and blow away the molten metal, creating a clean cut. Safety precautions are crucial when using an oxyacetylene torch due to the high temperatures and flammable gases involved, including proper ventilation, protective eyewear, and the use of flashback arrestors.