3. Successful thermal heating of materials with ultrasound

Successful warm-up between two parts requires a number of approaches:

• the final appearance of the welded parts;

• nature of materials and shape of parts ;

• the distance of the welding plane from the bottom of the sonotrode ;

• the amount of energy stored by the sonotrode over time ;

• machine design, part and sonotrode assembly;

• the economic aspect;

• the environment in terms of possible pollution.