For wire ultrasonic welding, the geometry is important, Top-cable factory always follow IPC -A-620 to control it.
Acceptable - Class 1,
Process Indicator - Class 2,3
• Individual wire strands are distinguishable on compression
surfaces, but there are no loose strands
Defect - Class 2, 3.
• Any loose wire strands.
Defect - Class 1, 2, 3
• Any discoloration of the conductors
