Description
NIHONWELD NC-25 is a graphite-type iron-based welding electrode specially formulated for welding and repairing contaminated, greasy, oil-soaked, and dirty cast iron components where post-weld machining is not required.
This electrode provides excellent fusibility with cast iron and produces dense, strong, and crack-resistant weld deposits. Due to its high carbon weld metal composition, the deposited weld exhibits high hardness properties in the range of approximately 52–55 HRC, making it highly suitable for repair applications requiring wear resistance and durability.
NC-25 is ideal for maintenance and repair operations involving difficult cast iron parts exposed to oil, grease, or contamination where conventional electrodes may struggle to perform effectively.
Key Features
- Graphite-type iron-based electrode
- Excellent for contaminated and dirty cast iron
- Strong and crack-resistant weld deposits
- High hardness weld metal
- Excellent fusion with cast iron
- Suitable for repair and maintenance applications
- Ideal when machining is not required
Classification
- AWS A5.15 ESt
- JIS DFC Fe
- DIN EFeB2
Typical Chemical Composition of Weld Metal Deposits (%)
| C | Si | Mn | Fe |
|---|---|---|---|
| 0.92 | 0.11 | 0.36 | Balance |
Typical Mechanical Properties of Weld Metal Deposits
| Property | Value |
|---|---|
| Tensile Strength | 497 N/mm² (72 KSI) |
| Elongation | 22% |
| Hardness | 52 – 55 HRC |
Size and Recommended Current Range (AC / DC+)
| Diameter | Length | Current Range |
|---|---|---|
| 3.2 mm | 350 mm | 90 – 120A |
| 4.0 mm | 350 mm | 110 – 150A |
| 5.0 mm | 350 mm | 140 – 180A |
Welding Positions
- Flat
- Fillet
- Vertical Up
- Horizontal
- Overhead
Applications
- Repair of dirty and oil-soaked cast iron
- Maintenance welding applications
- Heavy equipment repair
- Cast iron crack repair
- Industrial repair work
- Non-machinable cast iron weld repairs
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