I'm using a clark 130EN MIG no gas welder and have been trying to weld cracked 40 ford running boards. I've used this welder many times but I'm having a problem with warping. I'm using .035 wire at a medium wire speed. The problem is when I'm about 3/4 done the metal is warped to a point where I cannot finish the job as there is to much of a gap left. I'm spot welding at first but it doesn't seem to help. Any suggestions.