Ultrasonic welding device comprising a sonotrode carrier and a sonotrode fastened thereto

An ultrasonic welding device, comprising:

• a sonotrode;
• and
• a sonotrode carrier which is formed to cause ultrasonic vibrations of the sonotrode;
• wherein the sonotrode and the sonotrode carrier have in each case a contact face and at least one of the contact faces is roughened at least in sections;
• wherein a roughened section of the contact face roughened at least in sections has an mean roughness depth Rz of at least 2.0 μm and/or an arithmetical mean roughness value Ra of at least 0.3 μm;
• wherein the mean roughness depth Rz is at most 14 μm and/or wherein the arithmetical mean roughness value Ra is at most 3.0 μm;
• wherein the sonotrode is fastened exchangeably to the sonotrode carrier in such a manner that the contact faces are pushed against one another,
• wherein the sonotrode is embodied as a flexural resonator which comprises a base body and at least one bending arm which projects from the base body;
• wherein the sonotrode is fastened exchangeably to the sonotrode carrier via the base body and the base body comprises the contact face of the sonotrode.