Designing for Spin Welding

Spin Weld Strength:

The spin welding process produces a welded joint which, in many cases, yields a weld strength that is consistently equal to or stronger than any other area of the part. As a result, the weld area can most often be exposed to the same strains and stresses as any other area of the part.

Common Spin Welded Materials:

  • Acrylonitrile Butadiene Styrene (ABS-Cycolac)
  • Acrylic-Styrene-Acrylonitrile (ASA-Geloy)
  • PolyOxy-Methylene (POM-Acetal & Delrin)
  • PolyAmide (PA-Nylon & Zytel)
  • PolyButylene Terephthalate (PBT-Valox & Enduran)
  • PolyCarbonate (PC-Lexan & Makrolon)
  • PolyCarbonate / Acrylonitrile- Butadiene- Styrene (PC/ABS-Cycoloy & Bayblend)
  • PolyCarbonate / PolyButylene Terphthalate (PC/PBT-Xenoy)
  • PolyCarbonate / PolyEthylene Terephthalate (PC/PET-Xylex & Makroblend)
  • PolyEthylene (PE)
  • PolyEthylene Terephthalate (PET-Polyester)
  • PolyMethyl MethAcrylate (PMMA-Acrylic & Lucite)
  • PolyPhenylene Oxide (PPO-Noryl)
  • PolyPhenylene Sulfide (PPS-Ryton)
  • PolyPropylene (PP)
  • PolyStyrene (PS)
  • PolySulfone (PSO-Udel)
  • PolyVinyl Chloride (PVC-Vinyl)
  • PVDF (PolyVinylidene Fluoride (PVDF-Kynar)
  • Thermo-Plastic Elastomers (TPE-Santoprene)

Spin Welding Joint Designs:

A good spin welding joint should have a weld area equal to or greater than a typical wall section of the part. Joints should also provide sufficient part-to-part alignment.

Spin Weld Joint Designs
Shear Joint Flanged Shear Joint Tongue & Groove Joint

Other Spin Welding Design Considerations:

  • Parts joint must be on a circular axis.
  • Determine whether or not final orientation of parts is required.
  • Joint design must take into account flash/particulate produced during the process.
  • Preferably, upper part half will be designed for use with drive features (areas for driver to engage part).
  • Ideal parting line will be parallel to the force applied by the driver.
  • Joint design must allow for sufficient collapse distance, insufficient collapse may cause poor weld strength/quality.
  • Material selection may have an impact on 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 fixtured part half.