What happens when there is a gap in the die on the punching machine?

1. It is unacceptable that roughness and defects affecting undercut quality and welding lap affect welding quality. Once found, stamping parts should be frozen immediately.

2. Visible and determinable flanging, unevenness and insufficient trimming have no influence on undercut, welding overlap and welding quality. Stamping parts with such defects are qualified in Zone 2, Zone 3 and Zone 4.

3. Slight flanging, unevenness and missing edges do not affect the quality of undercut and lap welding, and stamping parts with such defects are qualified.