10-6. GENERAL WELDING MAINTENANCE (CONT).
Crossmembers (4). These welds are located at the junction of the crossmember and the main rails.
Main Rails (5). The main rails provide a major portion of the load carrying capacity of the flatrack.
They support a portion of the load while loaded on the truck and trailer.
Stowage Boxes (6). Cracks in the sheet metal welds of the stowage box should be repaired before
reaching 2 in. (5 cm).
Stowage Box Mounting Studs (7). Cracks in the area where studs are located should be repaired. Missing
studs should be rewelded or replaced. Missing studs may be replaced by cutting the head off a 3/8 in. by
7/8 in. by 16 threads per inch screw (9.53 mm by 22.23 mm) (MS 90725-59). Weld screw to flatrack
wall in location where stud is missing.