i mean i assume its nodular or ductile iron. even though it welded ok using the steel rod the weld is probably brittle although i havent had a failure. hoping some of you guys have some insight on this

hi guys, long time reader of this site but 1st post. ive narrowed and modified quite a few axle housings over the years. my question has to do with gm housings like the 12 bolt made from 64 to 71. i have welded axle tubes on these housings in the past with mild steel filler rod with zero problems. n...