oxidation-corrosion-resistant Cast iron welding alloy NiFe-1

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Cast iron welding rod is often used to solve the engine shell, cover body, machine base, casting teeth appear wheel fracture, crack, wear, tamping hole welding problems. Because of high carbon content, uneven structure, low strength and poor plasticity, cast iron electrode is a poor weldability material, which is easy to produce cracks during welding, it is difficult to cut. In order to achieve satisfactory results in welding and repair welding of cast iron, it is important to pay attention to“Three-part material and seven-part process”, not only to choose welding rod, but also to adopt suitable repair welding method.
The following welding process is recommended as a reference for cast iron welding and repair welding: 1, first remove the welding parts of sludge, sand, water, rust and other debris; In addition, the carbon-poor layer and oxide layer on the surface of iron castings working under High Temperature and steam environment for a long time should be removed. 2. According to the shape and defect type of the welded part, the preparation measures such as groove opening, crack preventing hole drilling and molten pool modeling are carried out. 3. For the parts that need cold welding, preheat them at 500-600 ° C, choose suitable current, continuous welding, keep the preheating temperature during the welding process, cover the insulating materials such as asbestos powder immediately after welding, and let them cool slowly, in order to improve its crack resistance and processing performance. 4. For cold welding work pieces, prevent the base metal melting too much, reduce the tendency of white, prevent too much heat concentration, resulting in excessive stress, small current, short arc and narrow pass welding should be used as far as possible (the length of each pass should not exceed 50mm) . Immediately after welding hammer weld to relax the stress to prevent cracking, until the temperature dropped to 60 degrees C below another weld. 5, pay attention to arc hole when closing, in order to prevent the closing arc crack.

Model GB AWS Diameter(mm) Type of Coating Current Uses
CB-Z208 EZC EC1 2.5-5.0 Graphite Type AC,DC+ Used for repair welding on the
flaws of gray cast iron.
CB-Z308 EZNi-1 ENi-C1 2.5-5.0 Graphite Type AC,DC+ Used for repair welding on thin
cast iron pieces and machined surfaces,
such as some key gray cast iron pieces
like engine bearers, guide rails of
machine tools, pinion stands,etc.
CB-Z408 EZNiFe-C1 ENiFe-C1 2.5-5.0 Graphite Type AC,DC Suitable for repair welding
on key high strength gray cast iron and
spheroidal graphite cast iron,
such as cylinders,
engine bearers, gears, rollers, etc.
CB-Z508 EZNiCu-1 ENiCu-B 2.5-5.0 Graphite Type AC,DC Used for repair welding
on gray cast iron pieces not requiring
strength too much.

Chemical Composition of Deposited Metal

Chemical Composition of Deposited Metal (%)
Model C Mn Si S P Ni Cu Fe
CB-Z208 2.00-4.00 ≤0.75 2.50-6.50 ≤0.100 ≤0.150 Balance
CB-Z308 ≤2.00 ≤1.00 ≤2.50 ≤0.030 ≥90 ≤8
CB-Z408 ≤2.00 ≤1.80 ≤2.50 ≤0.030 45-60 Balance
CB-Z508 ≤1.00 ≤2.50 ≤0.80 ≤0.025 60-70 24-35 ≤6


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