Nickel 99 Cast Iron Stick Electrodes – ENi-CI, 1 lb Pack (Select Size From Options Above)

High-nickel cast iron electrodes designed for maximum machinability.
Washington Alloy Nickel 99 is an ENi-CI Stick electrode recommended for all-position welding of thin cast iron sections where maximum machinability is required. With a core wire containing approximately 99% nickel, the resulting weld deposit is relatively soft and can be shaped, milled, drilled, or tapped after welding.

Nickel 99 is especially suited for repairing cracked or porous castings and can be used to weld cast iron to itself or to compatible dissimilar metals such as low-alloy and carbon steels. The weld deposit color also closely approximates the appearance of cast iron.

Package Information: This product is sold in 1 lb packs. Select the electrode diameter required for your application from the options above.

Why Choose Nickel 99?

• Approximately 99% Nickel Core: Produces a softer weld deposit designed for maximum machinability.
• Excellent Machinability: Weld deposits can be shaped, milled, drilled, or tapped after welding.
• Cast Iron Repair: Designed for repairing cracked, porous, and damaged castings.
• All-Position Welding: Suitable for multiple welding positions with proper technique and parameters.
• Dissimilar-Metal Capability: Can join cast iron to compatible low-alloy and carbon steels.
• Color Match: Weld deposit color closely approximates the appearance of cast iron.
• AC or DCEP: Designed for use with AC or DCEP (DC+) welding current.

Best Applications for Nickel 99

Nickel 99 is best suited for light and medium-sized castings where maximum machinability is more important than maximum weld strength. Common applications include:

• Thin cast iron sections
• Cracked castings
• Porous castings
• Machinery parts
• Cast iron frames
• Cast housings
• Cast iron to carbon steel joints
• Cast iron to low-alloy steel joints
• General cast iron maintenance and repair

Available Sizes & Recommended Amperage

Note: These are typical manufacturer current ranges. Actual settings may vary depending on welding position, base material, equipment, joint design, and welding procedure.

Why Machinability Matters

Cast iron repairs often require more than simply filling a crack. The repaired area may need to be drilled for a bolt, tapped for threads, milled flat, or otherwise machined back to its original dimensions.

Because Nickel 99 produces a relatively soft, highly machinable weld deposit, it is particularly useful when post-weld machining is part of the repair.

Important Strength Consideration

Nickel 99 weld deposits have lower strength and ductility than 55% nickel cast iron electrodes. For this reason, Washington Alloy recommends Nickel 99 primarily for applications where maximum machinability is required or where weld stresses are not overly severe.

For heavier castings or repairs requiring greater strength and ductility, a Nickel 55 electrode may be the better choice.

Typical Weld Metal Chemistry

Typical Mechanical Properties

Frequently Asked Questions

What is Nickel 99 used for?
Nickel 99 is designed primarily for welding and repairing thin cast iron sections where maximum machinability is required. Common applications include machinery parts, frames, housings, cracked castings, and porous castings.

What does ENi-CI mean?
ENi-CI is the AWS classification for a high-nickel electrode designed for cast iron welding applications.

What is the difference between Nickel 99 and Nickel 55?
Nickel 99 produces a softer, more machinable weld deposit. Nickel 55 produces a stronger and more ductile deposit and is generally better suited for heavier or more highly stressed cast iron repairs.

Can Nickel 99 be machined after welding?
Yes. Machinability is one of its main advantages. The weld deposit can be shaped, milled, drilled, or tapped.

Can Nickel 99 repair cracked cast iron?
Yes. Washington Alloy specifically recommends Nickel 99 for repairing cracked or porous castings.

Can I weld cast iron to steel with Nickel 99?
Yes. It can be used for compatible dissimilar-metal joints between cast iron and low-alloy or carbon steels.

Can Nickel 99 be used on heavy castings?
Nickel 99 is generally better suited to thin, light, and medium-sized castings where weld stresses are not overly severe. For heavy cast sections requiring greater strength and ductility, Nickel 55 may be a better choice.

What polarity should I use?
Washington Alloy specifies AC or DCEP (DC+).

How is this product sold?
This Arc-Zone listing is sold in 1 lb packs. Select the electrode diameter required from the options above.