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Science might say no but after a period of non use, rolling the tank sure seems to help the arc smooth out.
When you Mig weld after a long period of non use. It seems to help to roll the tank
One test beats out 100 opinions. Cut and etch testing of a multi pass fillet weld using 7018 stick electrodes
Stick Welding with 3/16" 7018 electrodes on a multi pass fillet weld
Whether its a vertical weld or laying flat on the bench, the same techniques apply, but getting comfortable can be the main thing. The ABC's of welding are ...Always Be comfortable