sticky weld i had the same frob with my cosmo. turns out that the nozzle hole becomes enlarged very quickly especially if like me you hold the nozzle to far away from the weld. what happens is that rhe wire actuall welds slightly to the inside of the tip. replace the tip quite often. its better than the frustration and wasted time. i have welded a whole mine with my cosmo, which is actually a SIP welder and you can get info on the SIP website.