The fracture toughness of some flash butt welds in an improved rail steel (Cast No. 3826) (TN-FM-33)

If improved rail steels are to be used in C.W.R. track they will have to accommodate flash butt and thermit welds whilst retaining adequate toughness at the weld (certainly not less than the toughness of current BS.11 grades of rail steel). Although the transverse fracture of a weld is...