Most guys have never seen a 3/16" rod, and don't have a power supply with nearly enought amps to burn one. That being the case, a couple of passes with a 1/8" 7018 more than likely won't build as much heat as one pass with the much larger rod. That said, yeah, I know what your saying but my thoughts were that a hole cut and then welded back up by some one that doesn't do alot of cutting and welding would tend to be more of a problem (read new crack waiting to happen) than just not worrying about it. If it were me I'd much rather drill a small hole. In this case 1/4" diameter should be a gracious plenty as a vent, and much easier to weld up than a plate cut out of the side. Too a small hole is far less likely to propulgate a crack due to the round shape than a torch cut hole.
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