Welding Cast Iron With Mild Steel. Of these gray can be welded with difficulty and white is almost unworkable while ductile is rarer and a slow process. You will more likely than not end up with Martensite weak and non machinable hard.
On the other hand nickel stops the migration of carbon. Welding cast iron has two schools of thought one is hot and the other is cold welding. Regarding this can cast iron and steel be welded together.
The mild steel deposit will pick up sufficient carbon to make a high-carbon deposit which is impossible to machine.
Metals such as wrought iron or mild steel can simply be welded with minimal preparation. Gray iron and ductile iron will act differently. Yes cast iron can be welded to steel. Dont heat over 1400 degrees F since that will put the material into the critical temperature range.