Flame gouging is the process of producing a groove in the surface of a component or weld. Typical applications include the formation of 'U' or 'J' preparations on components prior to welding, removal of defects, and cutting back the reverse side of a weld.
Gouging is carried out using a torch through which oxygen and a fuel gas (acetylene, propane or mains gas) are passed. The surface of the steel is preheated by an outer ring of jets, and oxygen is directed from a central jet to the area to be gouged. Rapid oxidation of the steel takes place and material is removed by the pressure of the gases. Gouging is mainly a manual operation, but the torch may also be mounted on a tractor-type cutting machine to obtain narrow, deep grooves.
What is carbon-arc gouging?
What is manual metal arc gouging?
Job knowledge for welders:
Air carbon arc gouging
Oxygen-fuel gas flame gouging
Manual metal arc gouging
Questions and answers. Gas Welding and Cutting. 2nd Edition. P H M Bourbousson & K Leake. Publ: London; Newnes Technical; 1982. ISBN 0 408 01180 7.