With a thin sharpened chisel, cut down panel 3 of the threshold, remove the remaining strips of metal and clean the edges with a grinder. Mark out the new sill panel under the B-pillar, fit the panel in place and secure with the hooks. Weld the panel at the extreme points by gas welding, install the door and check the installation of the panel. The protrusion or recession of the threshold relative to the door should not be more than 3 mm.
Remove the door and weld the threshold panel to the mating contact welding parts with a pitch of 50-60 mm. Electric welding in a carbon dioxide environment with a current of 50-90 A or gas welding is allowed. Weld the panel to the B-pillar by gas welding and clean the welds.