FABRICATION AND ERECTION OF STRUCTURAL STEELWORK
In this method, the steel is heated locally by a pressurised mixture of oxygen and a combustible gas such as propane, which passes through a ring of small holes in a cutting nozzle. The heat is focussed on to a very narrow band and the steel melts at 15000 C when a jet of highpressure oxygen is released through a separate hole in the centre of the