Need Any Welding advice?

My trick to making the panel not warp is to move around to let it cool, but i keep the compressed air close and hit it immediately after putting down a small bead (usually only 3/4"-). It keeps the panel from absorbing the heat and making you go really slow. When my panels aren't fit well and I'm filling gaps , this really becomes necessary. I M H O. Oh.... and lately I have kept my gas as much as 30 lbs to really protect the weld, primarily helps with startup.