What is Ultrasonic Welding?
Heat! The key to the molding of thermoplastics. For the purpose of ultrasonic welding, the logic is simple – quick mechanical movements and friction create heat. The heat generates a thermodynamic reaction to the plastic and the two parts mold together.
To review this concept:
Ultrasonic high frequency electronic impulse → High Speed Mechanical motion → Applied Force/Friction → Thermodynamic Reaction → Plastic Molecular Bonding of Plastic Components’ Mating Surface
Why use Ultrasonic Welding?
Plastic manufacturing sometimes calls for the permanent assembly of two plastic parts. One common example of this is in valves. The assembly requires a diaphragm or spring combination of some sort between the joining of two plastic halves. This joint needs a solid, permanent and pressure resistant seal. One great solution we offer for this is ultrasonic welding.
Important Tips for Ultrasonic Welding Success:
The two main contributing factors to ultrasonic welding success of plastic components have to do with material choice and joint design. With these two areas given careful consideration, Ultrasonic success is just about guaranteed.
Material Choice: Since a molecular bond needs to be formed in a successful ultrasonic weld, material choice must be compatible between the two components that are being welded together. What the design engineer will look for is using materials that have the same chemical properties.
Joint Design: Qualified and experienced engineering will come in handy when designing a plastic part to be joined with another part via Ultrasonic Welding. Joint design will often depend upon materials chosen, the part geometry, and the function of the joint. The primary focus is on the mating component of the two parts.