After reading the pevous post I feel i must correct some assumptions. Welding CI is nothing like welding steel.This is meant with the best of intentions.I am not intending to criticise anyone.

I would like to clear up any mis understanding or misconceptions about the repair (fusion welding )of cast iron.
There are several different types of cast iron, each with different chemical make up, properties, working applications and carbon contents.
These variables make the repair of any given piece of work difficult to say the least.
Specialised knowledge is required to identify and succesful weld repair most cast iron. I have possibly thousands of hours accrued on welding the stuff in its various forms, so I feel qualified to speak on it.
It comes as white, grey, chilled, heat treated,malleable and spheriod varieties.
It is super saturated with carbon,up to 4% by volume in some variaties. High carbon content alone makes for very difficult conditions for welding. Add to this well meaning people who attempt to repair the said piece with some forms of adhesives.
The porous nature of the metal soaks up the adhesive and makes a possible sucessful repair extremely difficult as it interferes with the welding.

The carbon content also cause problems with the cooling rates.The cast iron usually has to be heated and cooled down as a whole unit as it can crack in thin sections


Depending upon the type of cast ion, its application and carbon content welded repairs can be
1. Cast iron filler rod applied with oxy acetylene process
2. Nickel based electrode repair- DC- electric welded
3. Powder Fusion - applied with an attachment to the oxy welding torch
4. Cupro - Nickel brazing rods applied with oxy acetylene welding.

The moral of all this is that if it is nearly impossible to repair a cast iron something unless you know what your about.If it hard to replace why cheapskate on a repair which may be shoddy.

I hope this assists everyone.
Grahame