Video shows walking the cup on a 2" carbon steel socket weld in a tripod vise. Socket welds are not commonly taught in welding schools so hope this helps
This video shows TIG welding several different alloys. Carbon Steel, 4130, Stainless, and Aluminum. Arc Length is key
5F position means the axis of the round member runs horizontal.
This video shows technique and hand position to maintain a good mig gun angle
