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There’s a slight difference in the look of fresh cracks in the material, but unless you’re experienced in determining this, it pays to find out from the manufacturer. The best way to tell what type of cast iron needs welding is to consult the product manual or contact the manufacturer, if it’s not stated on the material. Malleable iron: Not welded, as welding changes the properties of the metal, rendering it useless.
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Here is a list of their weldability:ĭuctile iron: Weldable but rare, as it’s an extensive and slow process. There are numerous types, and you won’t want to weld most of them.
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The first step of this kind of welding is identifying what type of cast iron it is.
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Following a set of guidelines on how to weld cast iron should ensure that your welds have no cracks and that the internal strength is sufficient to withstand the component’s purpose. Therefore, knowing what you’re doing is more crucial than ever. A wrong move can ruin your broken part even more, or worse, make your weld look strong when it’s internally weak. Either option can be chosen, but if you know how to weld and are up for learning a new skill, welding it yourself could solve your problem just as easily.Ĭast iron is one of the most challenging materials to weld. It can mean thousands of dollars in replacement parts or hundreds of dollars for hiring a cast-iron welding specialist. It’s a nightmare for any cast-iron machine owner to crack or break a vital cast component. Image credit: CC0 Public Domain, Max Pixel