Glossary of Terms
9-3
Digital Compact
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Near field welding
Welding at a distance shorter than 0.25 inch (6mm) from the point of
horn contact with the workpiece. Compare far field welding.
Overload
If the ultrasonic power applied exceeds the allowed maximum power of
the power supply, the power supply switches to overload condition and
stops output of ultrasonics.
Power Supply
The part of the system, transforming the line frequency of 50/60 Hz to
high frequency electrical energy of 20, 30, or 40 kHz.
Pretrigger
The activation of ultrasonics before horn contacts the part.
Programmer
The electronic component that controls the pneumatic and electronic
functions.
Resonant frequency
Also: Operating frequency. The frequency at which a welder operates.
It equals the excitation frequency of power supply and converter as
well as the self-resonance of booster and horn.
Settling time
Also: Start time. The settling time is the time it takes for the horn to
reach its self-resonance. The duration of this time depends on the
shape of the horn; in ultrasonic power supply units with Advanced
module the settling time may be modified using the dip switches.
(10, 35, 80 and 105 milliseconds).
Start force
The pneumatically generated force required for the downward motion.
A high start force enables high down velocity and thus short cycle
times. Low start forces ensures that the horn contacts the workpiece in
a smooth manner. The start force must always be higher than the trig-
ger force.
Stop, mechanical
A device in the press units of the WP series as well as actuators of the
AC series which prevents the horn from contacting the part fixture.
Time welding
In this mode of operation, ultrasonics are output during a pre-defined
period of time.
Trigger
Also: Dynamic Trigger. At the beginning of the weld cycle, the air pres-
sure within the pneumatic system of the press unit lowers the carriage
until the horn contacts the part to be welded. Then a mechanical force
required for transferring the energy to the joint area is built up. Ultraso-
nics are released as soon as the trigger force adjusted (e.g. 400 N) is
reached. The triggering of ultrasonics allows for almost constant appli-
cation of energy, adjustment to various applications, as well as easier
repeatability.
Summary of Contents for DC 222
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