I'm currently in the process of trying to get a good looking weld on stanless steel. My problem is that my welds turn out grey/dark grey as apposed to the blue/purple/yellow collors. Here are some examples of what I am talking about with the colors staying on the welds:
So here are some more details: I'm using a Miller dynasty 200dx, 100% argon (welding in DC), its either a 1/16 or 3/32 size tungsten, whatever it is its pretty small. The tungsten is poking out of the cup maybe 0.1" to 0.2". A gas lense with a #6 cup (also pretty small diameter). The filler I'm using is 308. The material I'm welding is 304 stainless steel, around 0.065" thick I believe.
I just can't quite understand what I'm doing wrong. I had someone mention that I'm probably not moving fast enough and that its overheating, causing the ugly color to appear, so I tried moving faster and I still get the same effect. (the metal nearby the weld is the rainbow colors, just the weld itself is always dark grey). The meterial pretty much instantly turns this dark grey, even if I'm just going to throw down a tack weld. Granted I believe I was using around 80amps to try and weld this tube together (which I also heard you should use 10% less amps than mild steel, so theoretically I should be using 58amps. But I have a peddle control and can only press it down half way to get less amps.
Anyways if anyone can give me some advice on what I'm doing wrong I would be very appreaciative!
Oh one last part, my gas guage reads in CFH I believe, and just double checking with the peddle down, what should it be reading? Thanks again!