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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.
Metal Composition %: 3.3C, 3.0 Si, 0.7Mn, 0.1 S, 0.5 P
U.T.S N/mm²: 200
Hardness BHN: 180
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.