Features and Usage：

• SN-55 uses Iron-Ni alloy rod, the cast iron electrode of graphite series.
• High strength, toughness, cracking resistance, smaller coefficient of expansion, slight hardening, and easy to mechanical process.
•  Use for nodular ductile cast iron, general cast iron maintenance, and hardening filling.

Precaution：

• According to the parent materials, formation, and dimension to preheat at 300℃ and post heat treatment at 500~600℃ afterwards, and finally room cooling.
• Proceed to hammer on each weld after the welding in order to reduce the shrinkage stress.
• Cast iron the poor ductility, it therefore the welding length is no more than 70mm for cracking protection on the edge of the joint due to high temperature.
• Welding more than two coatings the symmetrical welding on each coating should be taken by tack welding method in order to balance the heat on parent material, thermal stress, and cold surface balanced.
• Weld with a short arc and low current.

Covered Electrodes For Cast Iron

AWS  A5.15 ENiFe-CI
JIS   Z3252 DFCNiFe
EN   --
GB   T10044 EZNiFe-1

Welding Position：

Chemical Composition (wt%)：

Recommended Welding Parameters：AC or DC(+)