This rod is suitable for full fusion welding of cast iron, providing a high-strength weld metal which is easily machinable. It gives an excellent colour match and has the same structure as grey cast iron. Use SIF CAST IRON flux.
Oxy-Acetylene Welding with Super Silicon No 9
Broken castings should be aligned and tack-welded into position before pre-heating. All castings must be carefully supported on firebricks with a space of at least three inches beneath and preheated in a muffle to between 600ºc and 800ºc.
An oxy-acetylene flame, of ample capacity for the thickness of metal to be welded, is adjusted to a neutral condition. The edges of the fracture, or the sides of the vee groove, are melted by flame application; a little SIF Cast Iron Flux sprinkled in the weld area assists in forming a fluid pool of metal.
It is recommended that, on completion of welding, the casting should be brought once again to a uniform temperature of 600ºc - 800ºc and then allowed to cool very slowly inside the muffle. Cast iron welds correctly made by the oxy-acetylene process using Super Silicon No. 9 rods can be relied upon to provide a soft and easily machinable deposit with full physical properties similar to those of the parent metal. For spheroidal graphite cast iron, follow the above procedure and ensure you are using SIF Super SG Cast Iron.
Metal Composition%: 3.3C, 3.0 Si, 0.7Mn, 0.1 S, 0.5 P
Melting: 1250°c
U.T.S N/mm²: 200
Hardness BHN: 180