TOKO ENi-CI Pure Nickel Cast Iron Welding Electrode
High-purity nickel electrode specially formulated for welding all types of cast iron. The nickel deposit minimizes carbon migration from the base metal, resulting in a soft, machinable weld that resists cracking. Ideal for repairing casting defects, cracks, and broken sections.
Key Advantages
- AWS A5.15 ENi-CI compliant — ≥85% pure nickel deposit, certified chemistry.
- Machinable welds — soft deposit allows drilling, tapping, and finishing after welding.
- Crack resistance — nickel's ductility absorbs stresses, prevents hard zones.
- Versatile compatibility — suitable for gray, malleable, nodular, and alloyed cast irons.
- Low heat input — minimizes base metal dilution and heat-affected zone hardening.
- Available diameters: 2.5mm, 3.2mm, 4.0mm.
Performance Benefits for Cast Iron Repair
- Color matching: After machining, deposit color closely matches gray cast iron.
- Peening recommended: Light peening each bead relieves stresses, enhances crack resistance.
- Slag removal: Easy-detaching slag, minimal post-weld cleaning.
- All-position capability: Flat, horizontal, and vertical-up (diameter ≤3.2mm).
- Preheat flexibility: 150-315°C depending on size/complexity; slow cooling in insulating medium.
Packaging: 1kg (2.2lb) moisture-proof cartons, 5kg (11lb) bulk packs.
Primary Industrial Applications
Proven in maintenance and repair shops, foundries, and heavy equipment service centers.
Automotive Repair
Engine blocks, cylinder heads, transmission housings – machinable repair of cracks and broken lugs.
Machinery & Pumps
Pump housings, valve bodies, gearboxes – restoration of mating surfaces and flanges.
Foundry & Heavy Equipment
Repair of casting defects, blowholes, and finishing of new castings before machining.
Historical Restoration
Restoration of antique cast iron machinery, architectural elements, and sculptures.
Additional Applications
- Pipe fittings and plumbing fixtures
- Machine tool bases and frames
- Agricultural equipment repair
- Compressor casings
- Differential housings
- Welding cast iron to steel (butter technique)
- Repair of pattern equipment
Technical Specifications (Typical)
Chemical Composition (weld metal, wt.%, AWS A5.15 ENi-CI)
| Element | Min | Max | Typical (TOKO) |
|---|---|---|---|
| Nickel (Ni) | 85.0 | Balance | 88.0 |
| Carbon (C) | — | 1.0 | 0.6 |
| Manganese (Mn) | — | 1.0 | 0.5 |
| Silicon (Si) | — | 0.75 | 0.4 |
| Iron (Fe) | — | 8.0 | 4.5 |
Mechanical Properties (all-weld metal)
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 380–450 (typical) |
| Elongation (%) | 10–15 |
| Hardness (HB) | 130–170 (machinable) |
| Thermal Expansion Coeff. | Similar to gray iron, minimizing stress |
Recommended Welding Parameters (DC- or AC)
| Diameter (mm) | Current (A) DC- / AC | Preheat (°C) | Interpass °C |
|---|---|---|---|
| 2.5 mm | 50–80 | 150–260 | ≤260 |
| 3.2 mm | 70–110 | 200–315 | ≤315 |
| 4.0 mm | 100–140 | 200–315 | ≤315 |
* Use short arc, stringer beads. Peen each bead lightly. Cool slowly in dry sand or insulating blanket.
Certifications, Safety & Storage
- Classification: AWS A5.15 ENi-CI / ISO 1071 E C NI; manufactured under ISO 9001:2015.
- Safety: Use adequate ventilation – nickel fumes may be hazardous. Wear appropriate PPE (welding helmet, gloves, protective clothing).
- Storage: Keep electrodes in original sealed packaging. If exposed to moist air for >4h, redry at 250°C for 1 hour.
Batch-specific MTCs traceable to EN 10204 3.1.
Why Choose TOKO ENi-CI for Cast Iron Welding?
- 🔬 High-purity nickel — ensures soft, machinable deposits even on high-carbon cast irons.
- ⚡ Smooth arc stability — easy to control, especially on thin sections and edges.
- 🧪 Field-proven — trusted by maintenance teams in automotive, marine, and industrial sectors for over two decades.
- 📦 Global availability — local stock in key industrial regions ensures rapid delivery.