The use of acetylene for preheating during the thermit welding process (TM-MF-146)

Most aluminothemic welding processes used on British Railways incorporate a preheating sequence using a combustible gas/oxygen mixture. For the majority of site operations the combustible gas is propane (L.P.G.). Propane vapour is 1.5 times as heavy as air, hence the vapour can flow in still air for considerable distances along...