Systems and methods using an ultrasonic transducer and scrubbing horn motion to seal a part

A system comprising:

• a first horn including a first part-interfacing surface;
• a first ultrasonic transducer configured to impart ultrasonic energy into the first horn;
• a second horn including a second part-interfacing surface, the second horn being positioned relative to the first horn such that a part to be welded can be positioned between the first part-interface surface and the second part-interfacing surface;
• a second ultrasonic transducer configured to impart ultrasonic energy into the second horn;
• a memory storing machine-readable instructions;
• and
• a controller including one or more processors configured to execute the machine-readable instructions to:
• cause a first ultrasonic energy to be applied through the first horn via the first transducer to cause the first part-interfacing surface to vibrate back and forth along its length;
• cause the first horn to move in a first direction at a first time relative to the part to be welded;
• cause a second ultrasonic energy to be applied through the second horn via the second transducer to cause the second part-interfacing surface to vibrate back and forth along its length;
• and
• cause the second horn to move in a second direction at the first time relative to the part to be welded.