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3. Plastic
material
4. Shape and size of the work-piece
5. Distance between the contact surface and the welding head
6. Horizontal thickness of the sidewall and joint face
7. Cleaning and finishing of the surface (such as painting, electroplating
and mold release agent)
8. Ambient temperature of the work-piece
9. Mold adjustment preciseness
10. Harmonization of different plastic materials
11. External and internal damping, such as the obstruction of the gauge,
base, or internal objects
12. Welding head design
13. Support design of the base
14. Amplitude of the welding head
15. Energy delivered to the work-piece