G'day, I use the kempi 180 for steel no dramas at all. Changed the liner etc and can't get a decent weld on aluminium. Searched all over the net for correct flow rate etc. Using .9 wire and argon with adjustable flow meter. Can't get a flat weld. Just looks like a worm or a slug sitting on top. The gauge has got litres per minute on it. 20CFH is approx 9.5Lpm. Tried all settings and still ****. Is it me or is it the welders output. Driving me mad as boat in bits and want it back on the water 
