DCM00044 REV. 14 15
2.2 Overview of These Models
Figure 2.1 The Ultraweld L20 Actuator (Shown with Optional Nodal Support)
The Branson Ultraweld L20 system is comprised of a power supply, ultrasonic stack
assembly, application tooling, and mechanical actuator.
The Ultraweld L20 Actuator is the part of the system that rigidly holds and moves the
converter, booster and horn assembly known as the ultrasonic stack.
A pneumatic cylinder drives the actuator to apply a precise pressure to the parts to be
welded during the weld cycle.
The Ultraweld L20 Actuator requires a compatible Branson Metal Welding Power Supply for
power and control of the actuator’s operation and to provide ultrasonic power to the
converter in the actuator.
The Ultraweld L20 Actuator is designed with full, built-in pneumatic controls, and
mechanical controls.
2.2.1 Polar Shell & Ultrasonic Stack
The converter-booster-horn assembly, or ultrasonic stack, is supported in a steel polar
shell by means of two diaphragm springs. The diaphragm springs are mounted at either
end of the booster and are securely bolted to the polar shell. The diaphragm shaped
springs are made from titanium and are acoustically tuned at the 20 kHz operating
frequency. This system permits efficient transmission of ultrasonic vibration along the axis
of the ultrasonic stack while providing rigid mounting.
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