Ultrasonic welding process for sound-absorbing cotton of automotive interior ceiling

The invention provides an ultrasonic welding process for sound-absorbing cotton of an automobile interior ceiling, and relates to the field of automobile production. The ultrasonic welding process for the sound-absorbing cotton of the automotive trim ceiling comprises the following steps: (1) fixing; fixing the ceiling on a frame body structure with a clamping and fixing function; (2) matching and cutting; cutting the original sound-absorbing cotton into shapes matched with each other according to the internal space of the ceiling; (3) laying and fixing; the cut sound-absorbing cotton is laid in the internal space of the ceiling, and the center and the corners of the sound-absorbing cotton are bonded to the interior of the ceiling through double-faced adhesive tape; (4) welding; the surface layer of the sound-absorbing cotton is melted through ultrasonic welding equipment, and after melting, the other side of the sound-absorbing cotton is pressed, so that the melted surface and the interior of the ceiling are