FRICTION WELDING FOR LARGE THERMOPLASTIC ASSEMBLIES
Dizo Sonics supplies linear vibration welding machines for automotive and industrial thermoplastic parts with long, accessible seams. The platform is selected from part size, tool mass, required frequency, amplitude, clamp force, lift stroke and the validated time- or depth-controlled process.
Vibration welding creates heat through controlled relative motion at the plastic joint. It is often selected for intake manifolds, air ducts, reservoirs and large housings where a long seam can be clamped and the part can tolerate small in-plane motion. The joint normally produces some flash, so flash traps and cosmetic requirements must be addressed in the product design.
Machine selection is based on tooling mass and dynamics as well as part envelope. The ranges below summarize the legacy Dizo Sonics NC-Z platform family and must be confirmed against the current engineering configuration before quotation or publication of a firm model specification.|
Production requirement |
How the system addresses it |
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Large seam capability |
Frictional heating acts across the joint rather than point by point. |
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Controlled endpoint |
Time or collapse/depth strategies are selected during validation. |
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Application tooling |
Upper vibrating tool and lower fixture are tuned and supported for the part. |
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Production evidence |
Process curves, functional tests and repeatability runs support acceptance. |
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Application |
Typical joining requirement |
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Air intake manifold |
Long contoured seam with burst, leak and dimensional requirements. |
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HVAC / air duct |
Large plastic shell with accessible perimeter joint. |
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Automotive reservoir |
Compatible materials and seam designed for vibration motion. |
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Tail lamp / housing |
Selected geometries after cosmetic and thermal evaluation. |
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Industrial enclosure |
Large thermoplastic assembly with clamped flat or contoured seam. |
Linear vibration welding clamps two thermoplastic components and moves one part relative to the other at controlled frequency and amplitude. Frictional heating forms a melt layer along the joint, after which the motion stops and clamp force is maintained during cooling. The process is a strong candidate for large parts with long, accessible seams and suitable stiffness.
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Configuration |
Architecture |
Best fit |
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High-frequency family |
Approx. 210-260 Hz |
Lower tool-mass applications; model dependent. |
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Low-frequency family |
Approx. 100-125 Hz |
Larger tooling and part envelopes; model dependent. |
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Time-control mode |
Endpoint by programmed weld time |
Useful for development and stable applications. |
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Depth-control mode |
Endpoint by collapse/displacement |
For controlled melt development and dimensions. |
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Parameter |
Reference value |
Engineering note |
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Reference series |
NC-Z150 to NC-Z2000 |
Seven legacy platform sizes |
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Frequency range |
Approx. 100-260 Hz |
Platform and tool-mass dependent |
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Amplitude range |
Approx. 0.1-4.0 mm |
Model dependent; confirm peak/peak convention |
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Reference tool-mass range |
Approx. 5-200 kg |
Upper-tool limit varies by model |
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Reference upper platen range |
310×330 to 2010×1000 mm |
Model dependent |
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Reference lower platen range |
760×450 to 2116×1100 mm |
Model dependent |
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Lift stroke |
Approx. 300-800 mm |
Model dependent |
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Process control |
Time and depth modes |
Six-stage programmable reference |
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Power supply |
380 VAC reference |
Destination standard to be confirmed |
Important: Published values are reference configurations, not a universal performance guarantee. The approved quotation, application trials and general arrangement drawing define the supplied machine.
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Parameter |
Engineering purpose |
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Vibration frequency |
Selected by machine platform, tooling mass and application size. |
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Amplitude |
Primary driver of heat generation and must be balanced with material and geometry. |
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Clamp force / pressure |
Maintains interface contact and controls melt flow. |
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Weld time |
Time-based endpoint for stable applications or initial process development. |
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Collapse / weld depth |
Displacement-based endpoint for tighter control of melt development. |
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Brake and alignment phase |
Stops relative motion in the correct final position before cooling. |
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Hold / cooling time |
Stabilizes the joint while maintaining fixture support. |
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Control element |
Available project function |
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Time and collapse/depth |
Two complementary endpoints for process control and fault detection. |
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Frequency and amplitude |
Machine status and programmed values monitored during the cycle. |
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Force / pressure |
Verifies clamping conditions and helps detect loading variation. |
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Final alignment |
Brake position and part datum checks protect dimensional requirements. |
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Tool identification |
Optional ID confirms the correct upper/lower tool and loads the matching recipe. |
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Functional result |
Leak, burst, flow, mechanical or dimensional tests according to the customer specification. |
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Weld curve |
Time, depth/displacement and pressure-related results can be reviewed by recipe and cycle. |
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Tool identification |
Machine confirms the installed upper/lower tool before loading the matching recipe. |
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Alignment check |
Brake and final-datum conditions are verified before the part is released. |
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Functional testing |
Leak, burst, flow or strength results are included in the agreed sampling or inline plan. |
The final control plan, parameter limits, data fields, retention period and failure-recovery logic are agreed with the customer. MES connectivity is optional unless it is explicitly included in the project scope.
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Material or design factor |
Application guidance |
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PP, PE and TPO |
Common candidates for automotive and industrial large-part applications. |
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PA, including filled grades |
Often suitable; moisture and reinforcement require trials. |
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ABS, PC/ABS and selected PC grades |
Feasible with suitable joint design and controlled amplitude. |
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Glass-filled resins |
Can be good candidates but affect tool wear, flash and process settings. |
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Dissimilar or soft materials |
Require grade-level compatibility testing and may favor another process. |
Always confirm weldability with the exact production resin grade, additives, fillers, color, moisture condition and molded-part geometry. Generic resin-family names are not approval evidence.
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Option |
Project scope |
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Platform |
High- or low-frequency machine sized from part, platen and tool-mass study. |
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Tool change |
Tool cart, lifting support, quick connectors and identification. |
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Motion / pressure |
Programmable lift and pressure stages by controller scope. |
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Inspection |
Leak, flow, burst, dimensional or vision-test interface. |
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Acoustic enclosure |
Guarding and sound-reduction package based on plant requirements. |
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Loading concept |
Manual, ergonomic shuttle, rotary table, conveyor or robot handling, selected by takt and risk assessment. |
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Controls |
PLC/HMI brand, recipe capacity, user levels, languages and remote-support method confirmed by project. |
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Poka-yoke |
Part presence, orientation, variant, insert, fixture and tool verification. |
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Traceability |
Barcode/QR/RFID, cycle-result storage and customer-defined data fields as an option. |
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Inspection |
Vision, displacement, force, leak, pressure, flow or dimensional checks according to the CTQ plan. |
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Line communication |
Signals or industrial network interface; MES connection only when explicitly included. |
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Safety |
Interlocked guarding, safety doors/light curtains, emergency stops and safe reset concept to destination requirements. |
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Service package |
Training, recommended spares, preventive-maintenance plan, remote support and optional on-site support. |
The acceptance plan for this system focuses on joint strength and leak performance, flash, final alignment, time/depth process window, tool dynamics, repeatability and acoustic/safety controls. Quantities, test methods, limits, gauges and responsibility for production parts are agreed before detailed engineering.
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Acceptance activity |
Typical evidence |
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Documented scope review |
Approved specification, layout, utilities, interfaces, cycle definition and exclusions. |
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Tool and datum verification |
Part location, clamp support, tool identity and changeover checks. |
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Process-window trials |
Representative production parts across agreed material and dimensional variation. |
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Quality checks |
Agreed visual, dimensional, strength, leak, burst or functional test with defined limits. |
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Repeatability run |
Quantity, run duration, operator conditions and acceptance method agreed before FAT. |
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Safety validation |
Guarding, interlocks, emergency stops, reset behavior and maintenance access. |
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Data and alarm test |
Recipes, access levels, pass/fail windows, alarms, identifiers and interface signals. |
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Training and handover |
Operation, changeover, maintenance, backup/restore and agreed documentation. |
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Stage |
Main input or activity |
Output / decision |
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1. Application review |
Parts, materials, joint, CTQs, takt and plant standards |
Feasibility risks and missing inputs |
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2. Concept and quotation |
Process choice, layout, tooling, controls, interfaces and exclusions |
Approved technical and commercial scope |
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3. Trials and samples |
Production-equivalent parts and agreed test method |
Process window and sample evidence |
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4. Detailed engineering |
3D design, risk review, I/O, safety and documentation plan |
Customer design approval |
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5. Build and debug |
Machine, tooling, programs and internal run-off |
Ready-for-FAT review |
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6. FAT |
Agreed parts, run quantity, quality checks, takt and documents |
Punch list and shipment release |
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7. Installation and SAT |
Utilities, setup, training and site acceptance run |
Production handover by agreed scope |
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Please provide |
Why it is needed |
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Complete upper/lower part 3D |
Used to check envelope, datums, access, tooling and machine layout. |
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Exact resin grades, fillers and moisture condition |
Required for process feasibility and a grade-level trial plan. |
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Joint cross-section and flash-trap design |
Required to complete the technical concept and remove quotation assumptions. |
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Part and anticipated upper-tool mass |
Used to check envelope, datums, access, tooling and machine layout. |
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Strength/leak/burst and dimensional limits |
Defines measurable trial, FAT and SAT acceptance criteria. |
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Takt, variants and utility standards |
Used to size stations, automation, changeover and capacity. |
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Question |
Answer |
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When should we choose vibration welding? |
It is a strong candidate for large thermoplastic parts with long accessible seams, sufficient stiffness and a design that permits small relative motion and flash management. |
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How is the machine model selected? |
Part envelope alone is insufficient. Upper-tool mass, required frequency, amplitude, force, stroke, seam and takt all determine the platform. |
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Can the process be controlled by weld depth? |
Yes. Time and collapse/depth modes are available on the reference platform; the final endpoint strategy is validated for the application. |
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Is the process suitable for Class-A surfaces? |
It may be, but fixture contact, vibration transfer, flash and surface protection must be evaluated with production-equivalent parts. |
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What information is required for an application review? |
Please send part 3D data and drawings, exact resin grades, joint or stake details, production-equivalent samples if available, CTQ and test requirements, takt, annual volume, variant mix, utilities and plant standards. |
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Can Dizo Sonics test our real parts before quotation? |
Yes. An application review and representative-part trials are recommended when feasibility, tooling concept or cycle assumptions need evidence. Trial scope, sample quantity and test method are agreed before testing. |
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How is the final cycle time confirmed? |
The committed cycle is based on trials and a complete sequence study including loading, clamping, joining, cooling, inspection, data handling and unloading. Published reference cycles are not universal guarantees. |
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Which plastic materials can be processed? |
Suitability is approved at exact-grade level. Resin chemistry, fillers, moisture, additives, color, recycled content, molded-part variation and joint design can all change the process window. |
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What documents are supplied with the machine? |
The project handover package can include the approved specification and layout, electrical and pneumatic documentation, manuals, maintenance plan, spare-parts list, parameter backup, inspection records and FAT documents according to the contract. |
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Do you support FAT, installation and SAT? |
Yes. FAT and SAT activities are defined in the project plan. Installation, training and on-site support depend on destination, responsibility split and the commercial scope. |
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Send Dizo Sonics your part drawings, 3D data, exact material grades, production samples, CTQ requirements and target takt. Our engineering team will review process feasibility, tooling, automation, validation and the information needed for a technical proposal.