Glossary of Terms
9-1Digital Compact
2002 BRANSON Ultrasonics Digital Compact Version 22.08.2002
9 Glossary of Terms
This glossary comprises concepts being of relevance for ultrasonic
joining technology.
Acoustic Stack
Also: Stack. Assembly of converter, booster, and horn.
Actuator
The stack is integrated into the actuator. The stack comprises conver-
ter, booster, and horn in a rigid enclosure. The up and down movement
required for applying a pre-defined pressure is usually generated pneu-
matically.
Afterburst Delay
Time delay between the end of the hold time and the start of the after-
burst.
Afterburst Time
The duration of the afterburst.
Afterburst
After completion of the weld cycle, ultrasonic energy is applied for a
short period of time in order to separate the part from the horn.
Amplitude
The horn's peak-to-peak displacement in axial direction. The length of
the peak-to-peak movement can be modified selecting a different boo-
ster or horn type, or by means of amplitude profiling.
Amplitude Profiling
Ultrasonic power supplies with Advanced module offer the possibility to
change the horn amplitude within a weld. This is achieved via an exter-
nal control or using a BRANSON Controller. Amplitude profiling allows
for precise control of the energy applied to a part during welding, thus
controlling the heating of the mating surface. Switching from one ampli-
tude profile to another does not involve any delays caused by pneuma-
tic components. Amplitude profiling enables a high level of strength for
the weld joints, and an improved finish.
Autotune
Automatic compensation for changes in resonant frequency. These
changes are mostly caused by external factors such as heat, tool
replacement, changed weld parameters or use of different materials.
Booster
A metal section mounted between the converter and horn. The shape
of the booster determines its ratio and the factor by which the ampli-
tude is increased or decreased accordingly.
Clamping force/ Weld Force
The pneumatic force exerted by the actuator on the workpiece.
Converter
A piezoelectric energy transducer which transforms electrical energy to
mechanical energy.
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