Matweld Welding Rods Cast Iron 3.2mm M006

The Matweld M006 is a premium, high-nickel (99% Nickel core) electrode specifically designed for the cold welding of cast iron. Unlike general-purpose steel rods, these are engineered to produce a soft, ductile weld metal that can withstand the stresses of cast iron's high carbon content, preventing the common issue of cracking during the cooling phase.

Technical Specifications

• Electrode Diameter: 3.2mm.
• Code: M006 (Pre-pack code: MAN0280).
• Core Material: 99% Pure Nickel.
• Classification: AWS A5.15 ENi-Cl.
• Current Type: AC or DC- (Electrode Negative) / DC+.
• Amperage Range: 80A – 110A (Optimized for 3.2mm).
• Hardness: Highly machinable (the weld bead can be filed or drilled easily).

Key Features

• Cold Welding Capability: Designed to weld cast iron with minimal heat input, which is crucial for preventing the formation of brittle "white iron" at the fusion zone.
• Exceptional Ductility: The 99% nickel deposit is very soft and can stretch as the cast iron cools and shrinks, absorbing the tension that would normally cause a crack.
• Superior Machinability: After welding, the deposit remains soft enough to be machined, filed, or tapped. This is essential for repairing engine blocks or gearbox housings where a flush finish is required.
• Multi-Position Welding: The stable arc and fast-freezing slag allow for welding in flat, horizontal, and vertical-up positions.
• High Conductivity: The pure nickel core provides excellent electrical properties, ensuring a smooth, low-spatter arc even at lower amperages.

Common Applications

• Engine & Machinery Repair: Repairing cracked engine blocks, cylinder heads, water jackets, and intake manifolds.
• Industrial Maintenance: Restoring worn gear teeth, pump housings, and pulley wheels.
• Foundry Work: Filling casting defects (blowholes or sand inclusions) in new cast iron components.
• Heritage Restoration: Repairing antique cast iron fireplaces, gates, and ornate garden furniture.

Usage & Professional Tips

• Strict Heat Control: Use a "stitch welding" technique. Weld short beads (approx. 25mm to 30mm) and allow the metal to cool until you can comfortably touch it with your bare hand before starting the next bead.
• Peening is Critical: Immediately after breaking the arc of each short bead, use a Matweld Chipping Hammer to lightly "peen" (tap) the glowing weld metal. This helps relieve internal stresses as the weld shrinks.
• Preparation: Grind out cracks into a "V" or "U" shape. Clean the area thoroughly with Herschell Clean Up Spray to remove oil and grease that often soaks into porous cast iron.
• No Pre-heat Required: While some cast iron jobs benefit from pre-heating, the 99% Nickel M006 is specifically designed for "cold" welding to keep the heat-affected zone as small as possible.
• Butter the Edges: If joining cast iron to steel, use the M006 to "butter" (coat) the cast iron side first before completing the joint with a standard steel or low-hydrogen rod.