For the 5 cars that have been welded, the folds have been removed, the butt joints are flat and there is no step (the solder joints have not been polished)
For the 5 vehicles that have been welded, the hem has been removed, and the butt joint is flat without steps (the welding points have not been polished)
For the 5 cars that have been welded, the flanging has been removed, and the butt joint is flat without steps (the solder joints have not been polished).