Preparation of mating surfaces

PREPARATION OF MATING SURFACES

1. Grind the metal sheet at the welding points using a sander.

   Tools required:

   • Pneumatic sander.
   • Disk-sander.

   

   CAUTION:

   • When using the sander, care should be taken to avoid excessively reducing the thickness of the metal sheet as this may adversely affect welding strength.
   • Thoroughly clean the metal dust from the ground surfaces and surrounding areas.
   • Metal dust reduces welding strength and can lead to corrosion.

   

   1. Correct
   2. Incorrect
2. Straighten the buckled areas with a hammer and dolly block.

   Tools required:

   • Hammer.
   • Dolly block.

   CAUTION:

   • Ensure that even the slightest buckling is removed, particularly on the inner panels or in hidden positions.
   • If all buckling is not removed problems may arise during installation in addition to a reduction in strength due to the concentration of stresses.
   • Carefully inspect the joint areas of each pillar.
3. Remove all traces of paint from the welding surfaces.

   Tools required:

   • Belt-sander.
   • Disk-sander.

   

4. Apply primer to the edges of the new components and body panels to be welded.