the axle tubes of the housing are usually not cast, they are usually tube steel, so it is ok to weld to them. you may need to pre-heat enough to get good penetration tho (but i don't know how much or if it is needed)
mig is cleaner, and the sections are not that thick, so should be ok.... as long as the welder and the wire is up to the task... practice with similar thickness metal (2-3mm thick?) and get the settings right first...
not sure about bending of the tube after welding either....
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