Stainless Steel needs either backing or argon shielding to the back side when the back side melts. Argon shielding usually gives the best quality but Copper or Aluminum backing can also work fine depending on engineering or code requirements
While downhill Welding using XX10 electrodes is still very common,The Oil and Gas industry is seeing more Low Hydrogen Root Pass welding procedures.
Since it is a far less common procedure, this video should help anyone get better at open roots with low hydrogen electrodes
Sometimes when you are out of practice, its good to just practice until things feel natural again. I welded a 3g butt on 11ga aluminum and the first try did not go so well, so I settled in and just stacked a few beads on scrap until things felt more natural and comfortable
This Video gives tips for TIG welding a 1G flat butt joint and how to watch the puddle sink to make sure you are getting penetration,
A tee joint fillet weld test in 11 ga thickness usually requires penetration into the root but not all the way thru the back side
