Ultrasonic welding.
http://www.ktu.lt/lt/mokslas/zurnalai/mechanika/mechtu_65/Kuprys365.pdf
The linked article deals with mainly mechanical properties, but you get the idea.
http://www.ktu.lt/lt/mokslas/zurnalai/mechanika/mechtu_65/Kuprys365.pdf
The linked article deals with mainly mechanical properties, but you get the idea.