Discussion
For ultrasonic welding, thickness of metal is usually restricted to:
Answer: A
Ultrasonic welding is usually restricted to metal about 3 mm thick.
Ultrasonic welding vibrates the parts against each other at high frequency (typically 20 kHz or more) under light pressure. The rubbing breaks up surface films and forms a solid-state bond, but the vibration energy that can be delivered is limited, so it suits thin sheets, foils and wires rather than heavy sections.
Thicknesses of 9, 12 or 15 mm are far beyond what the vibrating tool can join; the process is used for thin, dissimilar or delicate parts such as battery tabs and electrical connections.
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