Hi guys !

I need to build up a splined shaft from 52mm(top of spline is 60mm) up to 70mm O.D over a length of about 110mm then, anneal it, bore it 50mm I.D, turn it, carburize it, heat treat it and grind it for a bearing fit... 20CrMnTi Material is close to SAE3115 or 20MnCr5.

I have an AC stick welder and my welding buddy is a TIG welder by trade..

What welding/filler rod should I use for this job ?

Thanks very much !