@Jonfoc as a rule no, there's 2 options you can "dry wash" the weld which is generally considered bad practice and only done if really needed, basically running the torch over to make it prettier without filler, or you can run over it and put a cap on the weld with more filler which just makes the weld bigger and adds heat that shouldn't be needed, best to get it right first time.
to be honest I've only had 2 beads I wasn't happy with and I've sorted them accordingly, I more meant that I can make an even nicer weld as I've welded more, not so much the old welds where bad, just not as pretty to look at, and I went through about 4 metres of tube before I even touched the cage, wasn't about to destroy nearly 2k of tubes
Made lots of these test pieces, considering tube has to be about the hardest thing to learn on but really satisfying when it finally came together