supply of manufacture and supply of welding portionsmanufacture and supply of welding portions,manufacture and supply of welding portions for fusion welding of 60kg/60e1 (r-260 grade) rails by alumino thermic process with nominal gap of 25 mm using cap/ oxy lpg/ oxy propane preheati ng with 3 piece mould (zr-washed) manually pressed /core shooted with auto tapping thimble & single shot crucible.applicable rdso specification is irs t-19-2021 rev.7.0,applicable schedule of technical re quirement (str) is tdg0017, ver 4.0,list of required consumables as per annexure - a) (the alteration in drawing, schedule of technical requirement (str) and specifications issued by rdso up to one month p rior to tender opening date shall be applicable to this tender).. [ warranty period: 30 months after the date of delivery ] ]