Oxyacetylene welding. also known as Oxy-fuel Welding (OFW), includes any welding operation that uses combustion with oxygen as a heating medium. With this family of processes, the base metal and a filler rod are melted using a flame produced at the tip of a welding torch. Fuel gas and oxygen are combined in the proper proportions inside a mixing chamber in the torch. Molten metal from the plate edges and filler metal, if used, intermix in a common molten pool and join when cooling. Commonly-used fuel gases include acetylene, propylene, propane and natural gas.
The equipment used in oxyacetylene welding is low in cost, usually portable, and versatile enough to be used for a variety of related operations such as bending and straightening, preheating, post-heating, surfacing, brazing, and braze welding. Among commercially available fuel gases, acetylene most closely meets the requirements for all these applications. Cutting attachments, multi-flame heating nozzles and a variety of special application accessories add greatly to the overall versatility of the basic oxyacetylene welding equipment. With relatively simple equipment changes, manual and mechanized oxygen cutting operations can be performed. Metals normally welded include carbon and low alloy steels and most nonferrous metals.