A common TIG weld joint in welding school might be a 3F vertical multiple pass tee joint.
While A 3F TIG multiple pass fillet weld might be uncommon in industry, it is a good pretty good training exercise that prepares for TIG welding socket welds.
I used 140 amps on DCEN
#6 gas lens cup with 15-20 CFH argon flow
3/32” ER70S-2 filler rod
3/32” 2% lanthanated tungsten
For field welding, a scratch start tig rig would be a common setup but since I was in my shop, I used a foot pedal with machine set at 140 amps and I maxed it out.
I wanted to compare freehand to walking the cup on this weld so I freehanded the first half of each pass using a tig finger for a prop.
It is important to note that letting a weld cool between passes can be very helpful.
When a weld gets too hot, things can get messy. The puddle can get full of oxides and does not flow the same.
That is why welding procedures often list a maximum interpass temperature. ( a temperature the metal must cool to before welding the next pass)
This 3F tee joint is good training for a multiple pass fillet weld or a socket weld where multiple passes are needed.
For this video I used a PrimeWeld TIG 325x with water cooled CK 20 torch and a weldmonger #6 gas lens cup.
I used ER70S-2 filler rod in 3/32” diameter.
3/32” 2% lanthanated tungsten ( for DC welding 2% thoriated and CK LaYZr also work well)
