suck back on root pass of tig weld

what is the trick to crown the bottom of an open butt tig pipe weld? I have no problem getting an excellent root but flat is the best crown I can attain. More heat widens the root and causes the concavity... less heat doesn't seem to fuse


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tungsten angle should be as straight it as possible

side to side wiggle should be kept to minimum

this is where freehanding can be better than walking the cup because you can move forward and back instead of side to side make the root drive home instead of fan out.

jody--weldingtipsandtricks.com

anyone else wanna weigh in?