:-) If you mean on the panel below the battery tray your right, there should be two drains (You can see the state of them once they start to rust in the first picture below). I think it's a poor detail that blocks with muck etc and is often the start of rust in that area. Much as I like to make as it was in that area I do away with it and take care with the seam sealer (I'll photo it when I do it) to make sure there's a fall for any water to run off. It'll make sense when I get to that stage.
Sure, you need to be very careful grinding the welds down. Firstly the welds themselves need to be good with ample penetration and then when grinding great care needs taken to grind on ONLY the weld. I've no doubts about the strength, if I did I'd of redone the repair. Next photos show the depth of welds quite well, even when ground back there's more metal than before, the metal around the weld will deform before the weld (I've hammered on them enough, that creates it's own problem sometimes which I'll show later)
Next repair shows a section formed to fit on the captive nut panel that was badly rusted.
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