I have an assemble and weld gig. 400 parts to be welded. The pics show tech info. After welding I have to grind bead/surface back to flat. I'm trying to produce a flat bead, minimum bead height with sufficient penetration. I've tried spraying, using E70s-6 .030, 98/2, 24-27 V, 250-460 wfs. I'm using a MM252. Can anyone give advice. Thanks!