I have a 300cf argon for my main tank and a 150 for a backup.
The other day my 300 was very low so before I got started
I switched my flow meter over to my full 150.
Attempted to weld some 6061 and nothing I done would
produce a clean weld.
I put a fresh gas lens, cup, tungsten and collet on my torch
cleaned my filler rod and my work.
It would get a nice clean puddle and when I would add filler
the puddle would get contaminated.
I pulled my hair out for hours trying to figure it out.
I left the shop that afternoon and on the way home
I told myself the gas is the only thing that was different
from the last time I welded aluminum.
The next day I put the meter back on my nearly empty 300
and every thing was back to normal.
So if your having trouble like this it mite be your gas.
hi m8, i work in a welding shop in the uk. we mainly focus on stanless and aluminiumm we use a argon helium mix and we've had the same problem. we got two cylenders of BOC that the mixtures of helium were compleatly wrong. i had the same problem pulling my hair out for hours! after years of welding iv never had this problem before, hope it never happens again lol