Ultrasonic vehicle plastic welding:

Definition of ultrasonic welding: ultrasonic welding is a new technology for fusion welding of mature plastic deformation plastic products. Because this technology can replace the fixed method of solution, adhesive, nail or other mechanical equipment in the previous production and manufacturing, so as to improve the productivity and reduce the cost. The basic principle of ultrasonic welding is to convert high-frequency electromagnetic energy into high-frequency molecular thermal motion according to the ultrasonic generator, and then the molecular thermal motion is transmitted to the ultrasonic mold according to a set of amplitude modulator equipment that can change the amplitude. The ultrasonic mold transmits the received vibration kinetic energy to the joint of the product workpiece to be welded. In this area, the vibration kinetic energy is converted into energy according to the friction method to melt the plastic. Ultrasonic can not only be used to weld hard thermosetting plastics, but also produce and process textiles and plastic films.

Advantages and disadvantages of ultrasonic welding in automobile industry:

Advantages of ultrasonic welding: faster speed and automation technology.

Ultrasonic welding defects: limited by specifications, appearance and raw materials (ultrasonic welding is mostly for PP, PC, ABS, PA, PS and AMMA plastics).

Joint surface design scheme of ultrasonic welding:

Slope joint

Use slopes to achieve a complete face joint. Because uniform energy and large total welding area can be obtained, the welding has high compressive strength and good sealing.

Multiple engagement

Belonging to cutting and welding, the uniform heating capacity is obtained by touching the joint part by the surface in the vibration direction, and its sealing and welding compressive strength are very excellent. However, the burrs caused by welding will stay on the surface, especially when burrs are not allowed.

Cutting joint

It is in the middle between the slope joint and multiple joint, which is often used because it has good sealing and can reasonably weld the appearance outside the ring.

Fixed term connection of electric energy

A joint design method for concentrating electric energy on a convex part of a triangle called fixed term and the heat generated by continuous impact. The utility model has the advantages of simple appearance and less limitation on the joint part. However, for crystalline plastics, too hot parts cause softening and melting, which leads to problems such as arc welding in-situ stress damage and poor air tightness.