Ultrasonic Welding
Achieve the shape, function and seal your project demands – without adhesives, extra packaging, solvents or other consumables.
Ultrasonic welding uses high-frequency vibrations to securely bond two or more thermoplastic components. This precise, robot-controlled process is a value-added solution for complex molding projects, producing a consistent, air-tight seal without the need for additional chemicals or materials.
Today, manufacturers in the automotive, medical device, electrical and consumer goods industries trust ultrasonic welding to meet strict performance, safety and quality standards. Learn what to expect when you partner with American Plastic Products.
What Is Ultrasonic Welding?
How do you join separate plastic components without heat or adhesives? Ultrasonic welding converts high-frequency electrical energy into mechanical motion. At the same time, external pressure applied to the parts generates frictional heat at the joint.
This combination melts the plastic at the contact point, blending the parts together into a single, molecular bond. The process involves a tool called a horn, which delivers high-speed vibrations directly to the joint area of the assembled parts.
Ultrasonic welding has been a trusted process in plastic manufacturing for over 70 years, especially for parts that are too detailed or complex to mold into one piece.
Today, the process typically includes:
- Designing two or more parts with a weldable joint interface.
- Assembling the thermoplastic parts so they align properly.
- Positioning the horn against the top component.
- Using the horn to apply controlled pressure and vibration.
- Generating vertical vibrations (20,000 to 40,000 times per second) to produce frictional heat.
- Melting the joint surfaces briefly, then allowing them to cool and solidify.
- Maintaining pressure during cooling to ensure a strong, uniform bond.
Benefits of Ultrasonic Welding
Ultrasonic welding delivers reliable results across industries. Key advantages include:
- Fast cycle times, with molecular bonds formed in just one to three seconds.
- Cost-effective, automated production for complex components.
- Versatile use on flat films, textiles or 3D molded parts.
- Compact joint design, minimizing surface area requirements.
- Repeatable and consistent welds for high-volume applications.
- No need for glues, solvents or fasteners.
- Easy-to-recycle components.
- Lighter, more compact assemblies for streamlined shipping.
Applications for Ultrasonic Welding
Ultrasonic welding joins multiple thermoplastic parts into a single durable unit. Common applications include:
- Automotive components (i.e. bumpers, dashboards, tail lights)
- Household appliance parts
- Medical device housings and internal components
- Electronic casings and circuit housing
- Consumer product packaging
- Textile and apparel sealing
Our Capabilities
At American Plastic Products, we offer the precision and performance your job requires, backed by industry-leading equipment and expertise:
- Equipment: Our 900-series Branson ultrasonic welder supports parts up to approximately 20 in. long x 8 in. wide x 12 in. high.
- Part Design: We’ll help optimize your design for ultrasonic welding, including melting temperature, and compatible joint structures.
- Plastic Recommendations: We typically recommend materials like acrylonitrile butadiene styrene (ABS) and PPO (polyphenylene oxide) or combinations with compatible chemistries – such as ABS and acrylic – for strong, consistent welds.
- Joint Design: Parts are designed with a built-in energy director, a feature that concentrates vibration and heat at the weld point. We’ll help determine the right geometry and contact area for your application to ensure reliable, repeatable results.
Looking for a trusted ultrasonic welding partner?
Do you have a specific job in mind or need a reliable supplier for your operations? Contact APP today to learn more about our ultrasonic welding capabilities.