Trying to learn to TIG weld.
I should start by saying this is a learning journey for me.
My goal - to be half decent @ TIG welding.
As part of this, I'm making a new exhaust for my boat, which as it's a V8, will have an internal (inside the boat) crossover & secondary air injection. This is to reduce exhaust reversion, hopefully meaning I can run a wet exhaust, which is easy to then silence properly.
I'm using a Parweld XTT-202P welder
1.6-2mm 304 & 316 stainless
1-1.6mm filler rods
anywhere between 5 and 15 lpm argon to give shielding
Typically 55 amps seems to be about right.
Seperate bottle or argon for purging the inside of the exhaust.
I welded up the Tee's first, feeling all gung ho. However, despite only welding an inch at a time, I wasn't happy with the welds. They'll do the job, but I decided to go back top basics and practice more.
The general annoyance - cooking the stainless. I want a nice colour on the final weld, not a baked, overheated look. I have found I can get a nice colour - but at the cost of amps, which means I don't get enough penetration.
But when I increase the amps, I'm literally welding stupidly fast - I can hardly dab fast enough. Get a smaller HAZ, but still almost impossible to avoid cooking the metal.
The general message is "weld faster", but if I go faster, the puddle doesn't coalesce properly. If I add more amps, the HAZ is smaller, but I still get the cooked weld.
I think gas coverage might be part of the issue?
This is a few of my most recent attempts, and that last pic is my attempt today with the biggest cup I have @ 55amps - which I think has adequate penetration and it not too bad.
So anyway, got a mooseknuckle gas lens on order to try.
It's not easy!