Plastic Joining Technology
MHR Engineering specializes in four proven plastic joining technologies.
Each solution is designed to deliver strong, repeatable and permanent joints for thermoplastic components.
Our engineering team helps you select the most suitable technology for your application and production requirements.
Our Plastic Joining Technologies
1- Ultrasonic Welding
Fast, clean and precise plastic joining.
Ultrasonic welding is a highly efficient process for joining thermoplastic components. It offers short cycle times, excellent repeatability and minimal thermal impact on surrounding areas, making it particularly suitable for high-volume manufacturing where consistent weld quality is essential.
1
Ultrasonic Welding
2
Spin Welding
3
Heat Stakaing Welding
4
Hot Plate Welding
High Precision
Delivers accurate and repeatable weld with consistent quality
Fast & Efficient
Short cycle times and low energy consumption for higher productivity
Clean & Reliable
No adhesives or consumables, ensuring clean and strong joins
Core Components of an Ultrasonic Welding System
The performance of an Ultrasonic welding system depends on the proper combination of every component.
Ultrasonic Welding Generator
Ultrasonic Welding Transducer (Converter)
Ultrasonic Welding Booster
Ultrasonic Welding Sonotrode (Horn)
Ultrasonic Welding Fixture
Typical Applications
Engineering Considerations
Successful Ultrasonic welding depends on more than selecting the right welding machine.
Material compatibility, joint design, component geometry, weld energy, Fixture design, and Sonotrode (Horn) design all play critical roles in achieving reliable and repeatable weld quality.
At MHR, every Ultrasonic welding solution is developed based on the specific requirements of the product. Our engineering team evaluates each application to determine the optimal combination of process parameters, tooling, and equipment, ensuring consistent weld performance, production efficiency, and long-term reliability.
Ultrasonic Welding Stack
How Ultrasonic Welding Works
High-frequency electrical energy from the Ultrasonic Generator is converted into mechanical vibration by the Converter (Transducer) and transferred through the Booster and Sonotrode (Horn) to the joint interface. Under controlled pressure, the vibration creates localized intermolecular friction, causing the plastic to melt only at the designed weld area. When vibration stops, pressure is maintained briefly while the molten material solidifies into a strong and permanent plastic-to-plastic joint.
2- Spin Welding
Reliable joining for rotationally symmetrical plastic components.
Spin welding is a friction-based plastic joining process designed for thermoplastic parts with circular or rotationally symmetrical joint geometries. The process provides high weld strength, excellent repeatability and short cycle times, making it well suited for automated production and high-volume manufacturing.
Because no adhesives, solvents or mechanical fasteners are required, Spin welding offers a clean and efficient solution for producing durable plastic-to-plastic joints.
Strong & Repeatable
Produces high-strength welds with excellent process consistency
Fast Production Cycles
Short welding cycles support efficient automated manufacturing
Clean Joining Process
No adhesives, solvents or additional fastening elements are required
How Spin Welding Works
During the welding process, one thermoplastic component rotates against a stationary mating part under controlled axial pressure. Friction generated at the joint interface produces localized heat, causing the plastic to melt only along the designed weld surface. Once the required melt is achieved, rotation stops while pressure is maintained, allowing the molten material to solidify into a strong and permanent plastic-to-plastic joint.
Engineering Considerations
Successful Spin welding depends on more than simply rotating two plastic components together.
Material compatibility, joint design, rotational speed, axial force, braking accuracy, fixture alignment and final angular orientation all play an important role in achieving reliable and repeatable weld quality.
At MHR, every Spin welding solution is engineered around the specific product geometry and production requirements. Our engineering team evaluates each application to determine the optimal combination of process parameters, tooling and equipment, ensuring consistent weld performance, production efficiency and long-term reliability.
Typical Applications
3- Heat Staking Welding
Permanent fastening of plastic components without additional hardware.
Heat staking is a thermal forming process used to mechanically fasten plastic components by reshaping a molded plastic boss. The process creates a strong and reliable mechanical joint without the need for screws, rivets or adhesives, making it ideal for high-volume assembly of thermoplastic products.
Heat staking is widely used when plastic parts must securely retain metal inserts, electronic components or additional plastic parts while maintaining an attractive finished appearance.
No Additional Fasteners
Eliminates the need for screws, rivets and adhesives
Clean & Reliable Assembly
Produces consistent mechanical joints with excellent repeatability
Cost-Effective Manufacturing
Reduces assembly time, component count and overall production costs
How Heat Staking Welding Works
A Heated staking tool is brought into contact with a molded plastic post under controlled temperature and pressure. The plastic softens only at the tip of the post, allowing it to deform into a precisely formed head. After cooling, the reshaped plastic permanently locks the assembled components together without introducing additional fastening elements.
Engineering Considerations
Successful Heat staking depends on proper boss geometry, material selection, staking temperature, forming force and cooling time. Tool design plays a critical role in achieving uniform head formation while preventing material degradation or cosmetic defects.
At MHR, every Heat staking solution is engineered according to the product geometry, material characteristics and production requirements to ensure consistent assembly quality and long-term reliability.
Typical Applications
4- Hot Plate Welding
Strong and reliable joining for large and complex plastic components.
Hot Plate Welding is a thermal joining process that permanently bonds thermoplastic components by heating the mating surfaces with a precisely controlled heated platen before pressing them together. The process produces strong, hermetic and highly repeatable welds, making it ideal for large parts, complex geometries and applications requiring leak-tight plastic-to-plastic joints.
High Weld Strength
Suitable for large and structural parts
Hermetic & Leak-Tight Joint
Ideal for tanks, manifolds and pressure applications
Large & Complex Parts
Perfect for parts not suitable for Ultrasonic or Spin welding
How Hot Plate Welding Works
The mating surfaces of two thermoplastic components are brought into contact with a temperature-controlled heated plate. After the plastic reaches the required melt depth, the heated plate retracts and the components are immediately pressed together under controlled force. As the molten material cools, it forms a strong and permanent plastic-to-plastic joint with excellent structural integrity.
Engineering Considerations
Successful Hot plate welding depends on precise control of plate temperature, heating time, transfer time, welding pressure and cooling conditions. Joint geometry, material compatibility and fixture design all contribute to achieving consistent weld quality and long-term product performance.
At MHR, every hot plate welding solution is engineered according to the product geometry, material properties and production requirements to ensure reliable and repeatable manufacturing.
Typical Applications
Not sure which joining technology is right for your product? Our engineers can evaluate your application and recommend the most appropriate joining solution.