... effects is quite well, strong firmness. Ultrasonic double top spot welding machine Product descriptionLihan machinery co, ltd is one ... concept. Sales hotline: 15989910854.“Hongda”brand Ultrasonic double-head spot-welding machine: According to features of original transducer, output ... to operate the machine. It is quite suitable for spot-welding, welding, stitching process production of non-woven fabrics ...