Welding Cast Iron (#20) - Engine Builder Magazine

Welding Cast Iron (#20)

Next, the crack must be fully “V” notched and ground smooth before welding can begin. I use a stick welder with a high nickel electrode, preferably with 85% nickel. This makes the weld softer and less likely to crack and easier to machine.

When a high carbon electrode is used the high carbon content of the cast iron (usually 2-4%) is pulled into the weld pool and that along with the high carbon content of the electrode makes the weld become very hard and possibly crack unless precise pre-heat and post-heat treatment procedures are followed. This is not always practical in a small shop.

It is always a good idea to do a simple pre-heat (even when using high nickel electrodes) with an acetylene torch getting the iron to about 250°F -500° F.  If repairing a deep crack or complete break, do it in several passes to prolong the cooling rate. A cast iron weld using this procedure can be easily machined or ground smooth.

Jim Kovach

Kovach & Assoc. Performance Engine Building

Parma, OH

You May Also Like

Shop Solutions – October 2023

A written warranty provides benefits for you and your customer. It sets expectations, protects both parties and is a great marketing tool that encourages repeat business.

Engine Builder and Engine Pro present Shop Solutions in each issue of Engine Builder Magazine and at enginebuildermag.com to provide machine shop owners and engine technicians the opportunity to share their knowledge to benefit the entire industry and their own shops. Those who submit Shop Solutions that are published are awarded a prepaid $100 Visa gift card. Submit your Shop Solution at [email protected]. You must include your name, shop name, shop address and shop telephone number. Submitted Shop Solutions not published will be kept on file and reevaluated for each month’s new entries.

Shop Solutions September 2023

Engine shop tips and tricks.

Shop Solutions August 2023

Engine shop tips and tricks.

Shop Solutions July 2023

Engine and machine shop tips and tricks.

Shop Solutions June 2023

Engine and machine shop tips and tricks.

Other Posts

May Shop Solutions 2023

Engine and machine shop tips and tricks.

April Shop Solutions 2023

Engine and machine shop tips and tricks.

Shop Solutions March 2023

If I’m not using torque plates, I tape up both sides and trim out the bores. I use painter’s tape, which comes off easily and doesn’t leave any glue residue. I get much less oil in the spray washer this way.

Shop Solutions February 2023

Check out February’s shop tips and tricks.