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@chiroshi
I wouldn't imagine it'd be possible with a normal soldering iron, you'll need to get the surrounding metal up to temperature which will need a lot more power / surface area than an iron can supply.
It'll be possible to braze it with a gas torch (maybe there's a framebuilder on here that could help?)
Only other solution would be that stuff they use to seal old fuel tanks. Though would involve removing the rad, fully draining etc.