I have welded cast iron a number of times... and there is an art to it...
it needs to be pre heated
you need to do exactly as the other post said... v groove the break, make sure its good and clean
use a special nickel rod designed specifically for cast iron welding... btw this is also the correct rod for tacking the oil pump pickup to the pump housing so it doesnt ever fall off... ( a drag for a 3k motor)
it would not make sense ,even if you could find the wire and I dont think a specialty one is made.. or at least I have never seen or heard of one , to use with a mig...you would have lots of wire left over... even a mini spool
NICE deep penetration with a buzzbox... I cant remember, (its on the rod box), if its an ac or dc rod... usually you can buy a pack of 5 (lincoln brand)
rod does not store well... 5 of them should be able to fix the entire crack....
let the cast cool naturally... of course no h2o... although you can put it in sand to cool...
the porosity of cast iron makes it brittle and preheating/natural cooling is necessary to prevent some of this
I think about 125 amps is the setting to start...
hope this help
