28kHz 35kHz 40kHz 100W-500W Ultrasonic Welding Transducer for Plastic Spot Welder

This piezoelectric ultrasonic welding transducer utilizes PZT-8 hard ceramic elements secured by a pre-stressed bolt assembly. Equipped with a standard threaded interface, it can be integrated with a welding horn (sonotrode) and a generator to form a complete ultrasonic welding system.

Applications

The 28kHz model offers high amplitude and strong penetration, making it suitable for welding plastic parts (3–8mm thick) and sealing flexible packaging. The 35kHz model balances efficiency and precision, ideal for non-woven fabrics, face masks, diapers, and general plastic components. The 40kHz model provides concentrated energy with a minimal heat-affected zone, designed for thin films, thin-walled parts, connectors, and the micro-welding of fine wires.

Product Advantages

Excellent frequency consistency; the PZT-8 material ensures low energy loss, minimal temperature rise during continuous operation, and negligible amplitude decay. The pre-stressed assembly, combined with high-temperature aging, guarantees stable amplitude over long-term use. The large-diameter ceramic stack provides a generous safety margin, offering high overload resistance and preventing cracking.

Manufacturing Process

Individual ceramic element sorting → stacking based on polarization direction → precise pre-tensioning via a central bolt → high-temperature aging for stress relief → re-verification of polarization → frequency tuning (via machining/grinding) to within ±1% → comprehensive impedance sweep testing and pairing → high/low-temperature and insulation testing → cleaning, marking, and packaging. Key quality control points include ceramic consistency, pre-tensioning force, and frequency-tuning precision.

Product Details

28KHz offers high amplitude and strong penetration, making it suitable for welding thick plastic workpieces and sealing flexible packaging bags.

35KHz provides balanced amplitude and high welding precision; it is widely used for non-woven fabrics, face masks, diapers, and spot welding of standard plastic components.

40KHz features focused energy and a small heat-affected zone, making it ideal for thin films, thin-walled plastic parts, electronic connectors, micro-welding of fine wires, and ultrasonic cutting; it is not suitable for large-area metal welding.

Specifications

Product Photos