Duster rocker panel welds

I got my duster back from the body shop last October. They removed the crappy rocker panels (not stamped) that I installed about 15 years ago and installed new AMD rockers. They also finished the body work and painted it Rallye Red. I was building new 3/8 fuel lines tonight and I noticed that a lot of the lower rocker panel spot welds don't hold. I have areas where 12" of the seam are loose ! When I originally replaced the rocker panels, I had spot welds every 2 inches. . Now I'm worried about the structural integrity since a unibody relies heavily on the rocker panels for rigidity. Can the rocker panel be welded without hurting the paint ? Any insight will be greatly appreciated !