Through its Solid State Joining Center, Coldwater has developed its SPINMeldTM  technology, which uses rotational friction to heat the materials along with pressure to create a solid state welded joint. In friction spin welding, one part is held stationary while the other piece is rotated on a spindle until the heat of friction between the parts softens the material to a plastic state, creating a solid state weld in fractions of a second.

Coldwater offers pre-production, prototype and low volume friction spin weld part production using its SPINMeld machines, which can join like or dissimilar materials including aluminum, magnesium, brass, steel and carbon fiber composites. SPINMeld machines are available to customers for integration into their work cell or as part of an automated processing line.


Problem: Our customer was interested in replacing clinch nuts with friction welded nuts on an automotive aluminum panel. Through a series of design iterations, verified by weld lab testing, we developed an M6 nut size and nut driver that would automate pickup and welding during production.

Result: After verifying the optimal nut design and process, Coldwater developed a two-machine solution that friction welds nuts on the same part on different ends, achieving an 11.6 second part-to-part cycle.

Benefits Include:

  • Consistent weld duplication
  • Multiple material welding
  • Significantly faster weld times
  • Environmentally clean and safe
  • Material loss is minimal
  • Process monitoring of weld parameters for statistical process control