Thanks Steve.
I did remember your pointer about leaving a small gap, or alternatively beveling the edges of the parts to be welded to promote full penetration of the weld from a college class in welding that I took many decades ago.
However my desire not to weld in a wobble inducing twist or out of round change in diameter, combined with the original thinness of the wheel parts allowed me to try welding from the inside first without these edge treatments.
I was fully prepared to have go back over the welds from the front face of the wheel afterwards.
However, I was pleasantly surprised to find that in the unavoidable small gaps that remained prior to my first pass, I could clearly see that the weld had fully penetrated to within a couple of hair's width of the original front face of the wheel, if not overflowed it by about the same amount. This is discernable in the shiny area of the picture that I previously posted. The deviation was so slight as to allow the void to be filled by just a couple of coats of primer, with sanding betwixt the spray sessions .
So that fact, plus the generous bead that now lays on top of the inside surface of the wheel, should make for a strength factor at least on par with its original.
In addition, I laid in some brazing in the lower sections of the bead, as well as along its edges, so as to both avoid areas of stress concentration, as well as make fitment of a tube, without creating any points of undue friction possible.
If you paid close attention you would see that the donor wheel was a split rim that requires a tube, whereas the recipient wheel is a tubeless type. Having my choice of either configuration, I will give it a try without a tube first.
BTW,- I did do a common sence stress test. I beat the wheel with a wooden 2 x 4 about as hard as I could expect a wheel to withstand without worry of bending an original all along its perimeter. No deflections noted.
I also tried this with a metal hammer to the point of being just shy of denting or bending it.
I got a nice even ring tone all round.