What would be the best method of thermal fitting SS316 parts onto one another? I have a long shaft and a machined bush which is to be fitted on the shaft. What I have come up with is to have a small machining cut on the shaft of about 0.3mm on the diameter so create a "step" where the bush gets a mechanical stop along the shaft length. Then the bush I.D will be 0.005mm more than the shaft diameter. Then soak the bush at 80C for 1 hour + cold soak the shaft at -30C for 1 hour and then insert the bush using a holding tool within 20 seconds of removing both parts from the chambers. Then as a secondary mechanical locking, can do laser welding on both sides of the bush with same filler material. I think this should be reliable enough. What say you, pro engineers?
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