Spin Welders | Trinetics Group

Spin Welders


Spin welder friction welding includes inertia spin welders and orientation spin welders available in standard or custom spin welder designed equipment.

A considerable advantage to the Power Spin Welder is its ability to produce welds in milliseconds. Not only is productivity increased because of fast cycle times, but this process also produces repeatable hermetic seals with the strongest weld joints possible. This is due to kindling of the joint occurs in milliseconds, which improves the integrity of the weld and significantly minimizes flashing. The capabilities offer many advantages over conventional spin welder.

Power Friction Spin Welder Models

SERIES 7100 – Inertial Spin Welder, Single Servo with Air Actuator
SERIES 7200 – Orientation Spin Welder, Dual Servo, Low to Medium HP
SERIES 7300 – Orientation Spin Welder, Dual Servo, High HP

Spin Welders Plastic Joining Equipment

Spin Weld Joint Design for Spin Welding


1. Parts joint must be on a circular axis.  Full rotation of part  not required.  This frees design typically limited by conventional spin welding.

2. Joint design should allow for sufficient collapse distance, insufficient collapse may cause external welding and possible flash  resulting poor weld cosmetic quality when applicable.

3. Determine whether or not final orientation of parts is required.

4. Flash produced during the process should be taken into  consideration.  However, our process produces a minimal amount inherent  to spinning only 1 or 2 revolutions.

5. Parting line must be parallel to the force applied by the driver. Typically, upper part half will be designed for use with drive features (areas for driver to engage part).  Optional tooling available that drives part without drive features.

6. Material selection may have an impact on joint design and welder type (orientation or inertial).  Part must be designed so that there is no contact (other than the joint area) between the spinning part half and the fixtures part half.

Tongue and Groove Joint Design for Spin Welder

Highly preferred and recommended for part alignment, forging molten plastic, maximum weld strength and “flash” containment.

Tongue and Groove Joint Design for Spin Welder

Tongue and Groove

Shear Joint Design for Spin Welder

Useful to maintain part alignment for loading both halves into lower nest and partially contain external flash/particulate

 Shear Joint Design for Spin Welder

Shear Joint

Flanged Shear Joint Design for Spin Welder
Ideal for internal and external flash containment.  Good weld strength achieved, but may allow for external flash in the case of multiple revolutions.

Flanged Shear Joint Design for Spin Welder

Flanged Shear

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