Folded corners / folded areas on welding edge

Check rollformer 

Cause:

• The clearance might be bigger than 0.10 mm.

Resolutions:

1. Check the clearance between bending wedge and upper rollformer shaft.
2. Take off the two M5 (black flat head) screws on both sides and turn the whole bending wedge support left and right, until you reach the needed clearance.
3. Lock the screws and double check the clearance with the feeler gauge.
   • 0.05 mm is too small and 0.15 mm is too big (depending on the thickness range of tin plates).