tooling refers to the fixtures which are attached to the vibrating assembly and lifting table that hold the work pieces in place. tooling is application specific, and must allow for workpieces to be quickly switched out after every welding cycle. it is imperative that the tooling matches the workpieces closely enough to prevent any relative motion between the tooling and the workpieces, as this would reduce the amplitude of the weld and lower heat input as well as dimensional tolerances.