How to Weld Cast Iron With an Arc Welder

Written by justin obrien
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How to Weld Cast Iron With an Arc Welder

Welding is an important component of any metalwork job. Welding cast iron with an arc welder is a highly sought-after skill because of the shear strength of cast iron and its use in various projects. Cast iron welding projects range from fixing a broken heating pot to welding a crack on farm machinery. It can be highly valuable to learn because of the high costs associated with welding work. The cost for welding work ranges from £16-$50 an hour. Imaging doing it yourself to save money while learning a valuable trade.

Skill level:

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Things you need

  • SMAW welder
  • Welding helmet
  • Safety clothing
  • Leather gloves
  • Wire brush
  • Welding hammer/pick

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    Welding Cast Iron With an Arc Welder

  1. 1

    Purchase or rent a SMAW (shielded metal arc welding or stick electrode) welder at your hardware store or equipment rental company.

  2. 2

    Plug your welder into a 220V outlet and then plug in your ground cord and welder electrode holder cord into the welder.

  3. 3

    Welding cast iron requires a special electrode. Purchase a 770 stick electrode to weld cast iron.

  4. 4

    Clean the surface to be welded with a wire brush.

  5. 5

    Clamp the grounding clamp cord from the welder onto the piece of cast iron to be welded.

  6. 6

    Place an electrode into the welder electrode holder, position the electrode near where the weld will start and pull your helmet over your face.

  7. 7

    Tap the electrode on the cast iron until it strikes an arc and begin to weave the electrode stick from side to side. Always keep the arc a half-centimetre or less away from the piece of steel you are welding.

  8. 8

    Allow the weld to cool for a few minutes, then use the welding hammer to chip off the slag from the top of the weld.

Tips and warnings

  • If you ever run out of electrode and need to weld more, remember to chip off the slag coating before continuing to weld.
  • Safety first. Wear proper welding protective eye wear, leather gloves, long cotton clothing and work in a well-ventilated area to prevent fumes and gas build-up.

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