DCM00044 REV. 14 23
2.5.6 Time
The time required to deliver the necessary energy is defined as the Weld Time. For most
welds, the time required will be less than one second. If more energy is required and all
other weld parameters are maintained, the weld time will increase (Figure 2.6
).
Figure 2.6 Pressure Variable with Increased Time
2.5.7 Amplitude
An ultrasonic tool is a resonant acoustical device. The term Amplitude is used to describe
the amount of longitudinal expansion and contraction that the tooling endures as it
vibrates (Figure 2.7
). The amplitude correlates to the scrubbing action at the weld
interface. This scrubbing action combined with pressure is what advances the weld by a
diffusing or mixing of the base materials.
Figure 2.7 Scrubbing Action on Weld Interface
As previously mentioned, the converter/ booster/ horn, (stack assembly), requires
minimal electrical power to initiate and maintain vibration in a ‘no-load’ condition. As the
amplitude increases, the power required to maintain the increased velocity of vibration
also increases. Subsequently, because of the increased Power less time is required deliver
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