Hi. I'm new to welding and recently acquired 180A MIG from R-Tech. I'm trying to ma ke spot welds on 1,2mm sheet and for some reason can't get proper penetration. I cleaned mill scale and tried various combination of voltage/wire speed settings but my welds won't go through on other side. As experiment I've tried to set voltage to max to burn hole in test piece but for some reason my welder wasn't able to do that. I'm using it with gas. Have you got any ideas?