I've been practicing with my 200N spoolgun on the I-MIG 250p. I started with 5356 .045 wire on 1/4" 6061 T6 and found there is no setting where it would spray. All I got was smoke and lots of spatter. I tried on some 2" x 1/8" angle with the same result. All material was clean, brushed and oil free. Using pure argon at 10 lpm and a 15 degree push angle. After searching the web for answers I came across another guy having the same problem. His fix was to switch to 4043 filler and all was well. I got some 4043 and now it sprays and makes a pretty nice weld but I have black soot around the outside of every weld. I also get a greenish flame popping from the nozzle every second or two with an odd sound. I cant find any place where air would be getting in the nozzle. The only cause I can think of is maybe the new piece of 1/4" pvc air line I used to connect the argon tank to the mig welder may be out gassing. Any suggestions ? I'd love to hear any tips or advise. I need to get this thing dialed in.