Final answer:
Oxyfuel gas welding is a process where metals are joined by heating them with a flame created from an oxygen and fuel gas mixture, typically with an oxyacetylene torch. It is used in various applications such as metal fabrication, cutting, and repair.
Step-by-step explanation:
The definition of the term "oxyfuel gas welding" refers to a welding process in which metal pieces are joined together by heating them with a flame produced by the combustion of an oxygen and fuel gas mixture, most commonly oxyacetylene. In oxyfuel gas welding, a torch is used to create a flame from the gas mixture, which can reach sufficiently high temperatures to melt the workpieces along with any filler metal being used. Common fuels include acetylene, propane, and natural gas. This traditional method of welding has been in use for many years and remains popular for various applications despite the rise of more modern welding techniques.
Such welding is crucial in industries like metal fabrication and repair, where the ability to join metals strongly and effectively is key. Acetylene gas, when used in an oxyacetylene torch, produces a flame hot enough to cut and weld metals, and is essential in creating numerous products from vinyl and acrylic plastics to fibers and resins. Additionally, the role of oxygen is not limited to welding; it is an oxidizing agent in rocket engines and is also used for life support in space missions, highlighting its importance and versatility.