The strongest bonds for large plastic parts with 3D weld contours

Thermoplastics can be welded together using INFRARED radiation. Some of the radiation in infrared welding is absorbed by the material and transformed into heat. As a result, the surface layer is melted and the plastic components can be joined by being pressed together. Infrared heat is transferred without contact. The heat input is fast, specific and energy-efficient.

Power-controlled and time-controlled INFRARED emitters allow for precise and controlled welding processes. Typical applications are instrument panels, door trims and center consoles with complex, 2D or 3D welding contours. Particle-free welding is particularly used for joining air-duct pipes, fluid containers, tank systems and filters or filter housings.


Customized to suit your needs

The following quality and efficiency factors of joined plastics vary, depending on the final product and application:

  • Particle purity, such as for air or oil duct components (increasingly strict OEM regulations and norms)
  • Use of reinforced, high-performance plastics, such as fiberglass reinforced plastics in lightweight and structural components
  • Higher yield strength in security-relevant areas
  • 100 % gas-tight
  • Weldability of different materials
  • Design freedom, including welding complex, 3D-geometries
  • Productivity, economic viability and energy efficiency
  • And much more!


Trendsetting products
  • Large components, such as instrument/door panels, center consoles, automotive battery compartments, etc.
  • Air ducts and fluid reservoirs
  • Storage tanks, tank filters
  • Housings, such as filter and light bulb housings, etc.
  • Technical parts for a variety of industries, such as aviation, sanitation and medical technology, white goods, electronics, toys, sporting goods, etc.


Tooling and equipment from a single source

The quality and performance requirements of infrared plastic welds vary by product and application. We have a large selection of standard production solutions in our product portfolio:

  • JoinLine IR-V-RPS-Maxi
  • JoinLine IR-V-RPS-1800 Standard
  • JoinLine IR-V-ECO-1600
  • JoinLine IR-H-Highspeed
  • JoinLine IR-V-ECO-800
  • JoinLine IR-V-ECO-1200
  • JoinLine IR-H-500

We would love to help you find the perfect infrared welding solution for your product.


Quick tool change for optimal handling and the highest efficiency
  • Tooling equipped with glass bulb or foil emitters
  • Modular cartridge system
  • Sandwich construction for optimal protection of emitter field
  • Quick tool change (within 5 minutes)
  • Several cartridges applicable for one machine
  • Tool change trolley available
  • Tool change can be operated from the front or back side of the machine, according to the production conditions


Custom solutions for your project requirements

Glass Bulb Emitters

  • Standard or special design, e.g. 3D contours
  • Energy-efficient, flexible heating via control of individual emitters
  • Radiation temperature approx. 1,800 - 2,400°C, power up to 200 KW/m²
  • Different wave lengths, reach operating temperature within 1 second
  • Short cycle times, typical heating period about 12 seconds
  • Greater distance to material
  • Energy direction transmitters can be used for toleranceadjustments

Metal Foil Emitters

  • Flexible contour, easy to adjust
  • Even the smallest radii are possible
  • Constant energy emission along length/width of the metal foils
  • Radiation temperature approx. 700°C, power up to 32 KW/m²
  • Mid-wave system (2,1 μm to 3,6 μm)
  • Operating temperature is reached quickly with the appropriate base load
  • Emitters must be close to material


Controls, monitoring, and documentation for your IR machine

Various part contours and materials produce numerous parameters in the electrical controls system. We offer sophisticated, intuitive controls technology for reliable, high-quality processing of both small and large welding zones, various materials and material strengths, visible edges, and controlling overlapping emitters.

Operation and parameter entry are completed on a comfortable TouchPanel, integrated into either the operating panel or controls cabinet, depending on the machine's layout.

The following monitors are installed in our machines:

  • IR emitter power monitor
  • Freely adjustable power and delayed power for every control loop
  • Welding path and pressure monitor
  • Welding depth monitored by automatic registration of material height
  • Heat input into welding seam can be recorded with INFRARED cameras and evaluated with image comparison
  • Scanning though infrared cameras



With FRIMO infrared welding machines, we've got it all covered.

Our standard machines are efficient in welding parts of all sizes. Various production layouts, as well as combined or special solutions, are possible depending on the project and customer requirements. We have implemented a variety of automated solutions, also in combination with other joining processes. Intelligent controls, monitoring, documentation and inspections provide comfortable operation and a reliable, efficientprocess that produces premium weld results. This includes modern communication interfaces, app monitoring, and Smart Service.

Infrared Camera Inspection Technology

Master Image
  • Heat input into welding seam recorded with IR camera
  • Tolerance window defined
Comparison Image
  • Each part recorded during production
Inspection Image
  • Image of temperature difference between master image and comparison image
  • Automatic flaw detection


  • Simple, robust machine technology
  • Modular construction
  • Cassette-style tools
  • Multiple cassettes can be used in one machine
  • Extremely simple, fast tool changes
  • Optimal protection of emitter field
  • Tool change carts; tool can be changed from front or back
  • Sophisticated controls
  • IR emitter power monitor
  • Freely adjustable power and delayed power for every control loop
  • Welding path and pressure monitor
  • Welding depth monitored by automatic registration of material height
  • Infrared camera inspection technology

FIT FOR YOU: Infrared Welding

Innovative technologies for your production.

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We support you in product development right from the start - worldwide.


Tailor-made automation solutions for maximum productivity.


By your side from pre-engineering to series production.

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