Quote:
Originally Posted by Tristan Lall
Do you have details on the alloys of the extrusions, plates and filler metal, and the heat treatment (if any)? I'm curious if there was explicit consideration of the reduction in temper of the alloy due to welding (heat-affected zone).
Also, let us know if there's any trouble fitting bearings into the machined holes, due to distortion in the welding process. Did you use jigs to ensure the gearboxes remain square? Or are you planning post-weld/post-heat-treatment finish machining?
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Everything is 6061 T6 with 4043 filler done with 100% Argon. With the thicker plates, we did do some preheating to aid in getting decent penetration and we make some attempt to slowly cool the pieces. Early on, we had some students quenching parts which is a big no-no.
On this particular assembly, we did use a jig to keep the bearing holes centered. On some of our smaller assemblies (i.e. those that will fit on our mill), we will machine them after welding.
Thanks for the comments!