Quote:
Originally Posted by GriffithMetal
Another thing to add to this cool discussion. If you are getting porosity in your weld and everything is clean and the gas is flowing, you may be boiling the weld puddle. If you are welding too slowly you can cause a "boiled" weld puddle.
I typically weld with ER70S-6 filler rod for my mild steel welds. I buy 36" lengths of 1/16" and .045" filler rod. 1/16" is for thicker metals 16 gauge and up to 1/8" thick. I use the .045" for 18 gauge steel. Sometimes when I weld thinner metals I will weld with .035". All ER70S-6. ER70S-6 has more de-oxidizers in it than the ER70S-2.  |
Funny that you mention this as I've just started having this problem.... and interestingly enough I'm welding faster than I used to. Only thing that I've changed is that with steel I've noticed it puddles better when I'm pushing the weld rather than pulling the weld like I do with aluminum so I thought that might have something to do with it.
I'm using 3/16 red stripe (can't remember if that is ceriated or thoriated) tungsten with 1/16 rod as most of what I'm doing is lighter gauge stuff. I did try 1/8" tungsten when I was experienting with the intercooler tubing but with the .065 aluminum tubing I was melting down the tungsten just trying to puddle the weld.