... 15mm plastic welding 4.Durable Hand held Ultrasonic Spot Welder for plastic, model HN300W- Suitable for thermoplastics ... 180mmApplications:-weld small size plastic of riveting, spot welding, embossing, locating and fixing rhinestones on ... moving, reliable performance, easy operation, mainly for spot welding, bonding, riveting, marking, sealing ,etc. ... Workshop Hand held Ultrasonic Spot Welder for plastic