Thanks guys!
Quote:
Originally Posted by Captainfab
What filler rod did you use on the inner shafts? Did you pre-heat?
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ER-70S-2, since that's what I had, and I've seen plenty of MIG welded shafts with the equivalent MIG wire (ER-70S-6) with no issues. I did a little preheat on the shafts, just enough to get them to where they were too hot to handle without gloves, but not much above that, as I didn't want to screw up the temper/heat treat of the shafts if they had any to begin with. After each pass all the way around the shaft, I let it cool to about the same temp (roughly ~200*F according to a temp crayon) before doing the next pass. If I had MIG welded them, I would've fully welded them out at once because MIG doesn't put quite as much heat into the base material because its faster.
Once I get all the outer stuff for this axle and confirm that the shafts run true and will for sure work, I'll probably have them cryo treated.