How can the ultrasonic welding head be welded to maximize the effect?
The correct interface design is very important for successful Zhuhai ultrasonic welding. Ultrasonic welding generally requires a small melting interface and a uniform contact surface. The interface design depends on factors such as the material to be welded, the shape of the weldment and the requirements of the weldment. Usually, the triangular shape part of the connection will gather ultrasonic energy and quickly melt to form a welding surface.
In order to achieve the best results, people have developed a variety of interface forms, but in summary there are three types: ultrasonic welding butt interface, shear interface and miter interface. Other forms of interface are improved products on this basis. .
(1) Butt Joint with Wedge-Shapes Energy Director is suitable for welding non-crystalline plastics, while for semi-crystalline plastics, the welding quality is not good. Since the flow temperature range of the semi-crystalline plastic in the molten state is relatively narrow, the energy guiding wedge will quickly solidify after melting, and it is difficult to spread to the entire butt interface surface, resulting in the formation of welds only near the energy guiding wedge, and the welding strength Very low.
(2) Shear Joint is the most effective joint form for welding semi-crystalline plastics. During the welding process, the initial contact of the local materials melts, and then the melting is continuously carried out between the materials in the interference part of the two parts. Under the action of pressure, the two parts are connected together along the sidewall sleeve. This type of interface is also suitable for non-crystalline plastics, and is most suitable for cylindrical parts, and can form high-strength air-tight welding.
(3) Scarf Joint is also suitable for semi-crystalline plastics, because the melting process occurs on the entire interface surface and does not involve the flow of molten plastic. It is often used when the upper end is a thin-walled part, and the interface is a ring-shaped or oval-shaped part to avoid matching and contact problems at the mitered corners.
