... 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 VIP, which need to dip tin ... wire directly, the welding spot has the following benefits: 1. welding spot firm, prevent to cold Weld. 2. ... 60KHz ultrasonic unit, speed welding, low production costs. ultrasonic smart card spot welder