What's the general thoughts on the size of the tig torch cup openings. Currently I'm using a #5 with a 1/16th electrode. What does the number 4 or 6 ect offer above the others. Is there a general rule of thought on the electrode size and the size of the opening of the torch cup. I don't seem to have a contamination issue with any of the different cups I have been using.
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Tig torch cups