Strength of welds on gears

[sanddrag]

I don't know much about welding, but welding a gear to a shaft on only one side of it, can it take like 300 lbs of shear force at the weld? (wow that was poor grammar) Or would we have to weld it on both sides? It is a 45 T gear mated with a 14 tooth gear on a Chiaphua. The ID of the 45 tooth is .5" They are Martin steel gears and some sort of steel shaft.

I know you are going to say it depends on how good of a welder you have so I will tell you as much as I know: he is the welding instructor at a community college with about 20 yrs expreience. I'd just like to know in general terms if a weld on a single side will be good enough.

Is hot rolled or cold rolled better for this? Also, I measured the ID of the gear and the OD of the shaft it was going on and at most I could only find a +.001 difference. Will there be any problem with the gear axis not being parallel and colinear with the shaft axis?

Thanks.