OK Tubrodur 35 S M (formerly OK Tubrodur 15.40S) is a flux-cored wire for SAW hardfacing in conjunction with OK Flux 10.71, depositing a manganese chromium-molybdenum-alloyed weld metal with a hardness of 32-36 Rockwell C. Suitable for surfacing wheel runners, track links, wheels and rollers for conveyor belts, wheels for mine trucks, rolls and shafts, where a hardness within the range of 32-40 Rockwell C is desired. With negative polarity, less heat input to the base material, less dilution of the weld metal and a higher deposition rate is obtained.
In most cases, surfacing with OK Tubrodur 35 S M can be performed without preheating. The need for preheat and increased interpass temperature is determined by the weldability of the parent material in question and the form and dimensions of the workpiece. Whenever possible, surfaced axles and similar objects, which are exposed to bending stress during rotation, should always be stress relieved at 500-600°C.