Those are not welds. What you're looking at is the bead of body panel caulk used to fill any seams in the spot welded body. Looks perfectly normal to me. It is meant to be applied liberally with only a minimal attempt to neaten it up.
If you touch/tap the caulk, you will find that it's not hard like a weld would be, but rather, has a rubber/plastic/wax feel.
BTW, you should be glad BMW does this. Not all brands are as thorough with seam caulking.
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