... of Bank card, smart card and VIP, eliminating the need for pre-welded solde ultrasonic smart card spot welder in the production of Bank card, smart card and ... following benefits: 1. welding spot firm, prevent to cold Weld. 2. same size welding spot, consistency. 3.welding spot small, easy ... . 7. 60KHz ultrasonic unit, speed welding, low production costs. ultrasonic smart card spot welder