Ultrasonic weld seams are created through high-frequency mechanical oscillation under pressure.

During metal welding with ultrasound the electric oscillations created by a generator (sound converter) are converted into mechanical oscillations which are then transferred to the work pieces (absorber panel and copper pipe) by an amplitude transformer and a sonotrode (welding tool).

The mechanical oscillations induced onto the work pieces at a certain pressure are absorbed at the contact surfaces of panel and pipe, thus causing the two materials to rub against each other at their interfacial limit with a high shear force. The resulting molecular and interfacial friction generates heat, which then creates a friction weld.

Advantages of ultrasonic welding:

• No special surface cleaning is required
• No cover gas is required
• No welding filler material is required
• Low energy consumption
• Low welding time

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