1. Product material
2. Energy guiding point design
3. Debugging the accuracy of the ultrasonic welding tools
4. Temperature around the plastic parts.
5. Welding head material
6. Welding head design
7. Amplitude of the welding head
8. Support design of bottom ultrasonic welding nest
9. Design of contact surface and joint surface
10. The shape and size of the plastic parts
11. Surface treatment
12. Energy transferred to the plastic parts.
13. The compatibility of different plastic materials
14. Other factors: filling materials, ultrasonic welding fixtures, etc.
