At the lower common European ultrasonic weld
frequency (20 kHz) and with larger applications, a full enclosure around the welding system is normally more desirable to support noise suppression.
Diagnostic of a good ultrasonic weld
: Within 150 millisec after weld initiation, all parameters of the weld are up to specification and continue to operate smoothly to weld conclusion.
The body also undergoes an expanded ultrasonic weld
quality-testing program that was pioneered in the Astra body unit.
Lightweight and compact ultrasonic weld
actuators, along with process controls such as Herrmann Ultrasonics' Vario, offer this feature.
The actuator VE CS provides a rigid mounting of the ultrasonic weld
horn, easy alignment and extremely precise positioning of the weld horn.
The tensile shear strength values of the ultrasonic welded
aluminium joints are shown in Table 2 along with its welding parameters.
Because ultrasonic welding has much higher heating rates, peak temperature, and cooling rates compared with impulse welding, only ultrasonic welds
were studied with the DSC characterization to investigate changes in the material morphology.
The quality of a ultrasonic welded
joint depends highly by a series of technological, mechanical and acoustical parameters of the joining process such as: acoustic conditions for joint deformation, the amplitude and frequency of ultrasonic oscillations, the physical state of the contact surfaces, the physic-mechanical and physic-chemical properties of the joining materials, the intensity of the ultrasonic energy, the plastic deformation speed of the joining materials, the contact pressure and the duration of the ultrasonic activation process.
New Design Rotary Type Ultrasonic Welded
Since most ultrasonic welds
take less than 0.5 sec, it is critical to change speed quickly to achieve meaningful weld profiling.