How To Weld Grey Cast Iron. Dont heat over 1400 degrees F since that will put the material into the critical temperature range. Its primarily based upon personal preference but there are a few factors to consider.
To weld cast iron start by preheating the section youll be working to a temperature between 500 to 1200 degrees F so that its stable enough to work with. Preheating or cold weld. Typical preheat temperatures are 500-1200 degrees F.
Once a good weld deposit is made the two sides of the crack can be welded together.
Grey Cast Iron. Preheating the cast iron part before welding will slow the cooling rate of the weld and the region surround the weld. You can weld cast iron with every welding process provided you use the right filler material and welding procedure. During manufacturing carbon on grey cast iron advances into graphite flakes and changes into either a ferrite or pearlite crystalline microstructure.