Spin welding is one technique that some consider to fall under ultrasonic welding. Whereas an ultrasonic or sonic welder uses vibrations to connect two pieces of plastic together, a spin welder uses circular motion or spinning. It is one of the most popular techniques to use when working with thermoplastics. Plastic Assembly Systems has a number of proprietary spin welders that are ideal for use on their own or in conjunction with automation systems.

spin welder

The Process

Many of our welders feature dual servo technology. This provides the user control over the spin axis as well as the Z-axis. The welder holds one plastic part still, generally in the center of the base. The other part to be welded is attached to the spinning arm, which then rotates the plastic at the specified RPMs. The heat and friction produced by the spinning motion and contact with the still piece of plastic causes the material to melt and weld together. Under proper guidance, this has the ability to create a hermetic seal. This type of welding is ideal for the following types of plastics:

  • Akulon
  • Arnite
  • Stanyl
  • Xantar


There are many benefits to using this type of technology. Due to the circular motion of the spin welder, this is an ideal technique for welding together spherical or cylindrical plastics or resin. The use of our machines is also a relatively green option. There is no need to use any glues, epoxies, fillers, or other types of chemicals to weld the two pieces of plastic together. Most of our machines rely solely on the heat and friction of the spinning movement, meaning there is no need for extra energy from pneumatic systems or air compressors.

Contact PAS For Your Spin Welding Needs

Spin welding is a low-cost and low-maintenance option that places an industry-high level of control directly into the user’s hands. To learn more about our thermal assembly systems and other products, contact PAS directly by calling 203-393-0639. You may also reach us toll free at 866-882-1701.