I have a sheet metal part, tubing and sheet metal that looks like one of the sheet metal components has been shelled out. In the assembly for the weldment it isn't shelled out. There are no shell commands in the part at all.
I am making modification to the sheet metal part and the hollowed out piece is giving me real problems.
Attached is a screen shot of the part and the part in an assembly.
I have no idea why this is happening.