Im getting the hang of my new Clarke 160 en , but one thing i have noticed this afternoon was that the welds seem to get a little bit on the surface shall we say rather than a good penatrating weld .This seems to happen if i weld for long periods on a high setting , the welder does not cut or feel hot ,is it me looking for to much out of a diy joby or have i got probs already .I was welding 2 mm box fairly non stop for 20 mins or so , also i use co2 which means im tight and also welder must be set higher to get results i believe .Any thoughts ANDY