typical profile for an ultrasonic weld serves two functions:It
is designed as a tongue and groove joint in order to:
- facilitate the lay-up of work
- guide the two halves of the workpiece precisely
during the processing operation
energy director integrated in the contact zone acts
as an energy concentrator, and at the same time it supplies
the necessary molten mass for an optimum joint.
weld profile is adapted to the particular case of application,
i.e. there are several variations.
set-up parameters such as welding force and amplitude
are calculated to enable the top half of the workpiece
to move in phase with the horn.
bottom half lies in the fixture and is passive. This
brings about a phase shift in the movement between the
two halves of the workpiece, resulting in friction at
the point of contact.
highly intensive ultrasonic oscillation causes the point
of contact between the two halves of the workpiece to
melt instantly. The simultaneous input of force from
the press, which lasts longer than the ultrasonic pulse,
holds the welding halves of the workpiece until the
molten plastic solidifies.