Repairs on ANY metal, to do properly ( especially an over the road vehicle where the liabilities are greater) it is imparative to get a proper identificationof the metal. Educated guesses might get you by but that"s another subject for another time. DO NOT use a E6010 stick electrode !!!! TIG would be my first and only choice, but what's the base metal, any heat treat properties of concern, I'll bet there is, will the welding process distroy those properties, is the full joint CLEAN of all contaminates (grease, oil, dirt, oxidation, etc.), you can't keep the weld zone cool and weld at the same time, the grease and oil in the bearing race and further inside will get hot. It's called heat transfer, without heat you don't have a serviceable weld. In my humble opinion ------ you do NOT have enough general weld knowledge to tackle this job, buy a new part and make a mechanical repair not welding, you will only create more expensive repairs if you strike an arc. As far as the arc blow, keep your work clamp connection as close as possible to the arc ( inches away ) and I'll bet the arc blow will go away.