After ultrasonic welding, what to do if distortion is found?
1. Reduce the pressure (the pressure should be below 2kg).
2. Reduce the ultrasonic welding time (reduce the strength standard).
3. Increase the hardening time (at least 0.8 seconds).
4. Analyze whether the upper and lower mold of ultrasonic can be adjusted locally (if not necessary).
5. Analyze the main cause of product deformation and improve it.