Titanium welding cleanliness thresholds

This is moisture content in the argon shielding gas if you're welding titanium, either gas tungsten arc or gas metal arc. You look at the minimum bend radius — this is titanium six-four — and you can see that if you don't have a very good dew point, like minus 20 or minus 30. Typically if you buy a tank of pure argon, it might be around minus 20 or minus 30. You could order it to minus 60, but they have to do special precautions when they fill the tank from the liquid argon. If you start getting very much oxygen in there, the hardness is going to go way up by a factor of three. The minimum bend radius goes up, which means the minimum you can tolerate is larger. It makes it easier to crack. And the hydrogen content increases.