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Mil-Arc 20

For welding all weldable grades of case iron including: grey, malleable, ductile, meehanite, nodular, and cast iron to steel. Machinable.

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  • All position
  • Easy strike and restrike
  • Will not overheat, even on AC
  • Low spatter and fuming
  • Barium Free
  • Stable, strong, non-surging arc
  • Welds dissimilar metals
  • Welds through contaminants
  • Excellent for thin overlays


  • Versitile
  • Less stub / electrode loss
  • Consistant arc, no surging or spalling of electrode
  • Less cleanup / user friendly
  • Safer to use (potential inhaled toxin)
  • Excellent arc control and weld pool visability
  • Welds cast iron to steel
  • Offers porosity free deposit on poor casting
  • Strong, yet machinable, crack-resistant deposits


Mil-Arc 20 offers a perfect fit as a high strength, machinable, user friendly , and very economical nickel alloy that is barium free. These features, along with not needing to preheat the majority of repair applications, allows you to make many repairs in place without dismantling the equipment. Mil-Arc 20 nickel-iron content gives you the ability to weld many types and thicknesses of castings without cracking. The deposit has good machinability when running at least two passes over the application. Note: The first pass of any weld filler will have some amount of base metal dilution. When you appy a second pass over the first, you will dilute any hard spots which will increase the machinability of the deposit. Mil-Arc 20 typically requires no preheat on castings including: pump housings, vessels, gears, sprockets, engine blocks, transmission cases, etc. Consider our Mil-Mig 200 for you continuous wire needs.


Use Mil-Prep beveling and piercing electrode to remove cracks and fatigued metal. Drill or pierce holes into casting at the end of cracks. If necessary, use a low resin grinding wheel and wire brush to finish the preparation. Apply deposit using a medium arc and stringer beads, skip weld and peen lightly. Keep heat input on small, thin sections at a "hands-on" temperature. Pause and let slow cool to prevent overheating. For heavy sections, preheat to 500 F and maintain temperature within a 50 F degree radius until finished. Then, slow cool within a confined ambient temperature area.


Tensile strength: up to 65,000 psi
Hardness: HB 210

Current and Polarity: AC/DCEP (+)
Part #DiameterAmperage
SMAW Nickel

Millennium Industrial Corporation
Export, PA 15632

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