Final answer:
Vibration welding is the bonding method used to fictionally join circular thermoplastics together.
Step-by-step explanation:
The bonding method that is used to fictionally join circular thermoplastics together is Vibration Welding. Vibration welding is a process in which two circular thermoplastic parts are joined together by vibrating one part against the other under pressure and heat.
During vibration welding, the two circular parts are brought into contact, and then a vibrating motion is applied to one of the parts while the other part is held stationary. The friction generated between the two parts results in heat, which causes the thermoplastics to melt and fuse together. As the vibration continues, the melted plastic solidifies, creating a strong bond between the two parts.
Some examples of circular thermoplastics that can be joined using vibration welding include PVC pipes, automotive parts, and consumer electronic devices.