72 Burnt Cast Iron Electrode


72 is a nickel-iron non-conductive electrode formulated to join dirty and contaminated cast irons.  This universal electrode can be used to weld a wide variety of malleable, ductile, and nodular cast irons.  In addition, it is ideally suited for the repair of defective or cracked malleable iron castings.

There are occasions in industry where exceedingly dirty cast iron is encountered. 77, which bonds well to most cast iron does have a limitation.  Since 77 has controlled penetration, which is ideal for non-cracking and machinability, it may not be able to bond exceptionally dirty cast iron. 72 should be used for this application. It has a high penetration, can anchor deep into the subsurface of dirty cast iron, and seals in porosity generating contaminates prior to finish welding with 77. 72 is used for a cladding operation, then the weld is completed with 77.

Key Features:

  • Flux coating does not side arc even after being heated
  • Extremely strong arc drive penetrates surface contaminates
  • Special slag composition can be welded over without creating porosity
  • Extra nickel content insures crack resistance machinable weld

Note: Use stringer or moderate weave technique. When cladding, cover the entire base surface prior to finish welding.

CALIFORNIA PROPOSITION 65:  WARNING: This product contains chemicals including [Nickel], which are known to the State of California to cause cancer.  For more information go to www.P65Warnings.ca.gov
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