Weave vrs drag

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when i went to school, they tought use not to weave using mig and low hydrogen rods(7018)  infact he counted of on the weld tests if there was indication of weaving.  He wanted a smooth uniform bead.  but i see a lot of posts with people who weave.I would figure a weave is fine but can any tell me why I was instructed to do so. Is there any drawback to a weave that i dont know about.  maybe it is easier to get undercut...
Reply:Yeh undercutting can happen when weaving, but a little circular or back and forth motion won't hurt it may actually make your welds look better until you can run smoothly enough. But seeing how the instructor is having you weld straight you no doubt will be runniing fine beads.J P Streets Welding LLC
Reply:I'm thinking the instructor was trying to get everyone to the point where they could lay down a good beed first, and then intended to teach the concept of cover passes.  Time probably ran out before he got to cover passes.Appreciation Gains You Recognition-
Reply:well that was over two semesters ago and I got all the class done with an A before I was forced to leave school due to a family thing Id rather not mention.  got an f since I missed last welding test and final in the class.  Im working on my Business degree here at baylor(dont start) and am going to start taking courses again at tstc in the summer so I can get some skill to back up my hobby.  we did all kinds of tests but mainly focused on multipass fillets and grooves like 1f 2f 3f / 1g 2g 4g(missed)all were done with that smooth bead technique if thats what you were talking about cover pass....I understand the weave and its uses but wondered if a weave was superior to a 'drag' bead?B is what the bead would look like when observed form topC is a 6010 whip techniqueA is how we learned to do a fillet(3/16" rods) on 1/4 plate Attached Images