I'm still relatively new at TIG, and running into this bizarre issue where one single piece out of like 30 parts keeps showing massive porosity. All the other parts weld together perfect, but IDK, there are two welds on this middle part, where as soon as you start a puddle, it starts sputtering and making this nasty green plume. The same green color like when you dip tungsten. I tried grinding out the porosity, down to where I think it's clean metal, with no visible holes, and even after grinding it down, as soon as you start a puddle, it starts all volcanic sputtering. It acts almost like the gas gets turned off in this single exact spot. So, after sputtering, the tungsten is obviously contaminated, so I grind that off. Try a test arc on another section, works beautifully. Then, even after grinding it down, as soon as I try that spot again, starts all sputtering.
What I finally ended up having to do, was make this small patch panel to go over that weld, where I literally could not weld it without porosity. And even that patch panel, when the weld goes over the porosity section underneath, that porosity somehow rises up and contaminates the new weld.
The other weird thing, this cross part, the one I'm pointing to had this porosity issue in two separate spots, but again, every other part in the entire build welded together perfectly.
IDK, once porosity starts, shouldn't you be able to grind it down, and weld over it? What kinds of contaminants in the metal could cause sputtering porosity? When you see porosity starting, what should you do. Is it possibly to grind it down, and weld over it?
weld details: 3/32 ER70S6, 3/32 tungsten, 15-20 CFH, #8 gas lens, 1/2" stickout, 115A DC, welding A36 1/8 and 3/16 square tube, 4T trigger.
What I finally ended up having to do, was make this small patch panel to go over that weld, where I literally could not weld it without porosity. And even that patch panel, when the weld goes over the porosity section underneath, that porosity somehow rises up and contaminates the new weld.
The other weird thing, this cross part, the one I'm pointing to had this porosity issue in two separate spots, but again, every other part in the entire build welded together perfectly.
IDK, once porosity starts, shouldn't you be able to grind it down, and weld over it? What kinds of contaminants in the metal could cause sputtering porosity? When you see porosity starting, what should you do. Is it possibly to grind it down, and weld over it?
weld details: 3/32 ER70S6, 3/32 tungsten, 15-20 CFH, #8 gas lens, 1/2" stickout, 115A DC, welding A36 1/8 and 3/16 square tube, 4T trigger.
