How To Properly Weld Cast Iron. When welding cast iron on your own you need to know the critical steps involved in effectively welding cast iron. The most important thing to remember when welding cast iron is to move low and slow.
Preheating or cold weld. The single most important consideration in welding cast iron is to keep it out of the 150- to 500-degree F range. If theres a crack that youre trying to repair you need to properly dress it.
It is always preferred to heat the entire casting if possible.
Preheating the cast iron part before welding will slow the cooling rate of the weld and the region surround the weld. If theres a crack that youre trying to repair you need to properly dress it. Preheating or cold weld. How to weld cast iron with a MIG welder To maintain a nice weld use the MIG welder to maintain the lowest feed rate and the lowest current.