Brittle but strong in compression: why cast iron needs slow heat, special rods and a patient approach to repair.
Cast iron is used in machine bases, engine blocks, stoves, pipes and antique ornaments. It is strong when squeezed but brittle when struck or heated unevenly, so it cracks rather than bends. That brittleness shapes how it must be repaired.
Successful repairs use controlled preheat, short weld passes, peening and slow cooling. Different types, such as gray, ductile and malleable iron, behave differently, and oily or old castings are harder to weld. We test and give candid advice about whether a repair is likely to last.
Cracks rather than bends.
Reduces stress and cracking.
Relieves tension in the weld.
Gray, ductile or malleable.
Contaminated castings resist welding.
We say when repair may not hold.
Pick a welding process, size your steel or ballpark the cost.
Welding Process PickerPick the metal, thickness and location and see which welding processes suit the job.Try it 
Steel Weight and Material CalculatorEnter a shape and its size and see weight, stock lengths and how much steel to order.Try it 
Welding Cost EstimatorPick a project and a size and get a ballpark planning range.Try it Yes, with correct preheat, filler and technique. Results depend on the type and condition of the casting.
Rapid cooling and stress. Slow cooling and peening reduce the risk.
Sometimes. Brazing uses lower heat and suits certain repairs where welding would crack the part.
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