So when I went to frame building school at UBI they used WP-9 torches. They exclusively used #12 cups with a gas lens. They also exclusively used 1/16" electrodes. All of this for welding steel bicycle frames.
I happen to have a WP-20 torch, and I have been using a #8 cup with a gas lens.
When I went to buy a #12 cup, it turned out to be more difficult than I expected because I had to buy a larger gas lens for the larger nozzle.
I found this very handy diagram and chart from https://www.weldingcity.com/tig-weld...s-995795s.html

I happen to have a WP-20 torch, and I have been using a #8 cup with a gas lens.
When I went to buy a #12 cup, it turned out to be more difficult than I expected because I had to buy a larger gas lens for the larger nozzle.
I found this very handy diagram and chart from https://www.weldingcity.com/tig-weld...s-995795s.html
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