hi, im only 17 but im a certified mig welder and soo close to gettin collage certification on mag(stick) welder, i use a cebora welder, its small but its got tig, mig, and stick. the only one problem i have is slag, because i need to do a root run with a 2.5mm stick and a capping run with a 4mm rod, the issue is i end up with holes in the cap.. i brush and knock all the slag out of the root but it still makes holes in the cap. i also have problems with penitration of the root run, ive done 1 success full but weld with only 2 holes 1 at the bottom and one at the top, so i sawed them off, the penitration was perfect.. but i have to do 2 welds.. got any advise for me?