Will a need for the extra ground be a cause of my issue? If I run a bead on a flat weld I get a nice bead. However if I try to run a bead on an inside corner joint the metal only heats up and warps until a hole develops. No shiny puddle will form. My 250EX didn't have this issue before. Could there be something inside dirty that causes this? It's not the gas or technique. Thanks for all help.