The first one is one I have heard used here and I have used it as well incorrectly. Downhand. Most think it is vertical down welding like on pipe. That is not correct. Downhand as defined by AWS is "a nonstandard term for flat welding position". Flat welding position is defined as " The welding position used to weld from the upper side of the joint at a point where the weld axis is approximately horizontal, and the weld face lies in an approximately horizontal plane". Talking to a few CWI's today to confirm what it is we came up with this simple explanation, "welding horizontal usually dragging" not downhill welding. Look online and you will see the masses using this term incorrectly.
Another is "ground" used to discribe the copper thing we clamp on our piece to be welded. Technically this is incorrect. It should be "work lead". What about "MIG" and "TIG"? Metal Inert Gas cannot be correct due to the active gasses we use in welding. Same with Tungsten Inert Gas (not correct). And what about Heliarc? Technically that is a trade name and NOT a process. Here is a good one, "splatter" instead of "spatter" the metal particals expelled during fusion welding that do not form a part of the weld.
So, what other terms do you use that are not technically correct? I think there are many. We could probably learn a lot from this discussion.
-Jonathan
Edit; TIG uses usually argon and/or helium as a shielding gas and they are in fact inert. I am sorry I originally said it had active gasses.
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