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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchYes—but the headline needs qualification. Researchers at Graz University of Technology (TU Graz) reported two experimental, adhesive-free ways to join wood with polymer and composite materials: AddJoining, which prints a polymer component directly onto wood, and ultrasonic joining, which uses vibration, pressure and frictional heat to melt a thermoplastic interface into the wood’s pores.
The work, announced on August 28, 2024, is promising for lightweight hybrid parts in construction, furniture, automotive and aerospace applications. It is not yet a consumer-ready replacement for screws, bolts, epoxy or structural adhesives—and the public announcement does not establish that every listed metal was directly bonded to wood by both methods.
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What TU Graz actually developed
The research concerns two different joining routes, not one machine that combines sound and 3D printing:
- AddJoining: a polymer or fiber-reinforced polymer is deposited directly onto a wood surface using an additive-manufacturing process.
- Ultrasonic joining: a sonotrode applies high-frequency, low-amplitude vibration while pressing the materials together. Friction generates localized heat, melting the thermoplastic surface so it can flow into the wood before solidifying.
Both approaches avoid a separately applied adhesive, but neither is “chemistry-free.” Their performance still depends on polymer flow, adhesion, chemical compatibility and mechanical interlocking.
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TU Graz’s announcement describes the methods, materials and intended applications.
How AddJoining works
AddJoining uses fused-filament-style deposition to print a polymer-composite feature directly onto wood. In the initial demonstrations, the wood was untreated. The hot polymer penetrated accessible pores in the surface, then cooled and solidified.
The resulting interface combines:
- Mechanical interlocking: polymer hardens inside the wood’s pores.
- Interfacial adhesion: the polymer must wet and remain compatible with the wood surface.
- Geometric integration: the printed part can include ribs, bosses, brackets, mounts or other complex shapes.
After fracture, the researchers reported finding polymer inside wood pores and broken wood fibers embedded in the polymer. That pattern suggests that some specimens did not fail through a clean separation at the interface; failure occurred in the wood or polymer instead.
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A 2025 Advanced Materials Science presentation reported an ultimate lap-shear strength of 7.5 ± 1.1 MPa for a specific combination of European beech and carbon-fiber-reinforced PA6-15CF. This is a result for that material pair, specimen geometry, print setup and test method—not a universal rating for AddJoining.
See the TU Graz Advanced Materials Science 2025 abstracts.
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How ultrasonic joining works
Ultrasonic joining is closer to thermoplastic welding or friction-assisted joining than to ordinary “sound bonding.” A sonotrode presses against the assembly and transmits controlled ultrasonic vibration. The vibration produces frictional heat at the interface, causing the thermoplastic or thermoplastic-composite surface to melt.
The molten polymer flows into pores and surface irregularities in the wood. When vibration and pressure stop, the polymer cools and hardens, leaving a joint that relies on mechanical interlocking and adhesion forces.
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This process is generally suited to precisely localized connections, including spot joints. TU Graz describes it as potentially useful for larger components and relatively planar or two-dimensional structures, whereas AddJoining is better suited in principle to complex three-dimensional printed features.
Where metal fits into the story
The headline “wood and metal” is directionally accurate but can imply more than the public evidence shows. TU Graz named stainless steel 316L and Ti-64 among the tested materials, alongside beech, oak, carbon-fiber-reinforced polyamide and polyphenylene sulfide.
However, the detailed descriptions of the two processes focus primarily on wood joined to thermoplastic or polymer-composite components. The public announcement does not provide a complete material-by-method matrix proving that every listed metal was directly joined to wood using both techniques.
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- Supported Filament: Ideal: PLA, PETG, TPU, PVA, PET ABS, ASA; Capable : PA, PC; Not Recommended: Carbon/Glass Fiber Reinforced Polymer.
That distinction matters. A carbon-fiber-reinforced polymer component may form part of a metal-containing hybrid assembly, but that is not automatically the same as a finished wood-to-steel structural joint.
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Why adhesive-free joining matters
Removing a separately applied adhesive could offer several manufacturing benefits:
- Fewer formulation, coating and curing operations.
- Potentially simpler disassembly in selected product designs.
- Direct fabrication of complex hybrid geometries.
- Localized joining instead of coating an entire surface.
- More design options for lightweight wood-based components.
These are potential advantages, not proof of a lower environmental footprint. A proper assessment would need to include electricity use, equipment, polymer content, carbon-fiber content, cycle time, scrap, durability and end-of-life separation. “Glue-free” does not mean automatically recyclable, especially when wood is combined with carbon-fiber-reinforced polyamide.
Why wood makes the engineering difficult
Wood is a variable, moisture-sensitive biological material rather than a uniform engineering surface. Joint performance can change with species, grain direction, density, porosity, defects, roughness, temperature and moisture content.
Moisture is particularly important. Wood swells and shrinks as its moisture content changes, while metals and polymers respond differently to humidity and temperature. Those mismatched movements can place repeated stress on the interface.
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TU Graz research listings show continuing work on water uptake, interfacial adhesion, mechanical strength and environmental durability in beech–PA6-15CF AddJoining joints. That indicates durability remains an active research question, not a solved engineering assumption.
TU Graz 2025 research listings and 2026 Advanced Materials Science abstracts provide that later research context.
Which method suits which application?
| Method | Potential fit | Main limitation |
|---|---|---|
| AddJoining | Printed brackets, ribs, bosses, mounts and other complex three-dimensional features | Print speed, material sensitivity, bead orientation and process control |
| Ultrasonic joining | Localized or spot connections, larger planar components and repeatable production cycles | Requires suitable thermoplastic interfaces, tooling, access and pressure control |
| Adhesive | Broad-area load distribution and established structural designs | Cure time, chemical handling and difficult disassembly |
| Screw or bolt | Familiar, inspectable and field-serviceable connections | Stress concentrations, drilling, added mass and potential wood damage |
What could still cause a joint to fail?
- Poor pore penetration: the polymer does not flow deeply enough into the wood.
- Excessive heat: wood may char or the polymer may degrade.
- Insufficient heat or pressure: the interface does not form adequate interlocking.
- Wood splitting: loading across or along the grain may exceed the wood’s local strength.
- Moisture-driven movement: swelling and shrinkage may progressively damage the joint.
- Print anisotropy: AddJoining strength may vary with bead direction and layer orientation.
- Voids or contamination: dust, oil, finishes, moisture or incomplete deposition can reduce contact.
- Creep: thermoplastics can deform under sustained load, especially at elevated temperature.
- Fatigue: repeated vibration or cyclic loading may enlarge interfacial damage.
- Corrosion concerns: moisture and dissimilar metals can create problems in hybrid assemblies even when no adhesive is used.
Could this replace screws or structural adhesives?
Not generally—not today. The reported work demonstrates technical feasibility under controlled conditions, but it does not establish long-term outdoor durability, fire performance, impact resistance, fatigue life, crashworthiness, production tolerances, repair procedures or certification for buildings, vehicles or aircraft.
Before a construction or transportation component could rely on such a joint, engineers would need application-specific data for the exact wood product, polymer, geometry, load direction, moisture range, temperature range and manufacturing process.
The most defensible conclusion is that AddJoining and ultrasonic joining could eventually reduce or replace some fasteners or adhesives in selected applications, provided the joints pass qualification and certification requirements.
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What would need to be proven for construction use?
- Repeatability: consistent strength across wood batches, grain orientations and production shifts.
- Moisture resistance: performance after humidity cycling, water exposure and dimensional movement.
- Thermal performance: resistance to heat cycling, cold conditions and thermoplastic softening.
- Structural behavior: tensile, peel, cleavage, fatigue, impact and fracture testing in addition to lap-shear testing.
- Fire performance: assessment of the wood, polymer and hybrid interface as a complete assembly.
- Inspection: reliable methods to detect voids, weak penetration, contamination and incomplete joints.
- Repair and end of life: practical methods for replacement, separation, recycling or disposal.
- Manufacturing economics: cycle time, tooling, energy use, scrap and production throughput.
Is this a practical process for a workshop?
No. The research should not be interpreted as a home-workshop method. Reproducing it would require controlled additive-manufacturing equipment or an ultrasonic joining system, suitable thermoplastic feedstock, process development, tooling and mechanical characterization.
Industrial FFF systems from companies such as INTAMSYS, Markforged, Stratasys and WASP may be relevant to feasibility studies, but commercial printers are not automatically qualified to print structural polymer directly onto untreated wood.
Ultrasonic equipment suppliers including Emerson Branson, Herrmann Ultrasonics and TELSONIC offer industrial systems, but a wood/polymer joint would require custom sonotrode design, force and amplitude development, moisture control and validation. Equipment prices are typically quote-based, and a generic ultrasonic cleaner is not an equivalent tool.
The bottom line
TU Graz’s work is a real and technically interesting step toward adhesive-free wood–hybrid-material manufacturing. AddJoining uses direct polymer 3D printing to create mechanically interlocked features on wood; ultrasonic joining uses controlled vibration and frictional heat to form localized thermoplastic joints.
The strongest current claim is not that researchers have produced a universal, glue-free wood-and-steel replacement for every construction application. It is that two promising industrial joining platforms may one day reduce the need for conventional adhesives or fasteners in carefully designed, tested and certified hybrid components.
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