Ultrasonic Welding Reinforcement Process for Composite Air Filter Structures

inly applied to the fixed assembly of inner and outer protective nets, support frames and filter elements. Different from traditional glue bonding and mechanical stitching, ultrasonic welding uses high-frequency vibration instantaneous friction heat to realize molecular fusion connection between accessories and filter media, featuring firm connection, no damage, no auxiliary materials and high environmental protection.

In the production process, automated ultrasonic welding equipment adopts fixed-point positioning welding and overall ring welding dual modes according to filter specifications. For cylindrical heavy-duty filters, full-circle seamless welding is used to fix the outer protective net, ensuring uniform stress on the whole structure and no local cracking under strong wind pressure. For flat passenger car filters, multi-point symmetrical welding technology is adopted to balance the structural tension of the filter element and prevent fold displacement and deformation during long-term vibration.

This advanced process completely avoids the aging, degumming and falling-off problems of traditional adhesive bonding. The welding interface has high structural strength, good flexibility and strong vibration resistance, which can adapt to the frequent jitter and high-intake air pressure working state of vehicle engines. At the same time, the welding process does not produce chemical volatile substances, meeting international environmental protection export standards, and is the core assembly technology for high-quality export-grade air filters.