Short answer...don't weld the rad on the bike! Take it off and do it properly. It shouldn't be hard to find a rad shop specializing in these repairs. People in the third world can't afford new parts and laybor is dirt cheap, hence anything can be repaired.
It's okay to weld things on the bike, i do it all the time. I built my entire rack on the bike without disconnecting the ground. The key is positioning the ground properly so no current loops through fragile computers and such. Even with the ground disconected you risk having a ground loop through fragile parts. That being said, you will not preform a good dependable repair while the rad is on the bike. It has to be drained, dry and the repair location absolutely clean with a wire brush and acid fluxed before soldering.
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