Quote:
Originally Posted by sweetk30
looks to me like someone didnt block and sand like they should have done .
|
This car was neat as a pin and based on the work elsewhere on the car, I’d say the guy does indeed know how to block sand. This is the only area that got a flanged repair, and is the only area showing a paint defect. (Funny thing, the repairs done on the door skins using butt welds showed no defects at all) The tailgate repair panel was welded to the skin first using plug welds into the hidden flange, and then fully welded from one side to the other to prevent any independent movement of one over the other.
Double the thickness of sheet metal (effectively increasing the heat sink) and you will indeed alter the expansion and contraction rates. Put it next to a single layer, welded or adhesive, and the area between these differing expansion rates will show themselves over time. There is a reason why the auto manufacturers don’t use flanged attachment where a hidden seam is desired.