Today I got out my Clark mig 135te , I haven’t used it for a few years and haven’t really tried it on 2mm thick steel ,not sure or not if I’m getting enough penetration or strong enough welds, also I was getting brown soot,I’ve been using 0.8 wire and a Clark argon co2 mix,and a new real of 0.8 . My Practice lap joints ,see pictures. First attempt after a bit of practice and setting up . Back of first attempt. I was getting soot with all attempts. Last attempt. Back of last attempt , Is this enough penetration? Hints and tips welcome thanks .