backpurge
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Weighing the gas cylinder is not an accurate way of doing it, like I said earlier, you know your flow rate, you know your arc time, the only variable could be a degree of pre weld surge and post weld flow but depending upon number of stops and starts this will probably be negligible, yes weighing the wire reel will also give you an accurate figure for how much wire you have usedAm I being naïve here or would it be simpler, and even more accurate, to weigh the wire reel and gas canister before a 2 hour lesson and then post-lesson and work it out that way?