We produce many stainless exhaust components, as you can imagine they are round for the most part. Our qualification test consist of tig welding with filler a 347 SS tube atop a 10 inch 200lb positioner. This means for a right handed welder they must hold the torch with right hand, control heat with the right foot, hold and add filler with the left hand, and last they must control the positioner speed with the left foot. This does not seen too bad right????. It is a challenge even for the best tig welder to complete in the allowed 30 minute time frame. Adding that left foot really throws some people off.