I'm trying to weld square .040 2*1/2 tubing. I was using 3/32 7014, because I have it. I was getting a lot of crap in the weld. Assuming I let moisture get to it or it was just old, I bought some 3/32 and 1/8" 7018. At first things went well with 3/32 at 90v. Then it took a turn. Rod was...