Fully-Welded Sandwich Metal Panels: Test Data | Formivis
Fully-Welded Sandwich Metal Panels: Reported Stiffness, Weight and Validation Data
A fully-welded sandwich metal panel is a lightweight structural plate in which two thin metal face sheets and a load-carrying core are joined into a single metallic unit by laser seam welding, with no adhesives or mechanical fasteners. Formivis reports a typical aluminum build at 8.75 kg/m² areal density that reaches bending stiffness equivalent to a 10 mm solid aluminum plate (profile-reported), confirmed through tensile, compression and salt-spray testing correlated with finite element analysis. For engineers, that works out to roughly 67% less structural mass at equivalent bending stiffness, in panel dimensions that can be customized to the project envelope.
Laser Full-Welding: A Lower-Cost Route to Metallic Sandwich Panels
Sandwich construction places two thin, stiff face sheets on either side of a much lighter core, so most of the material sits far from the neutral axis where it contributes the most to bending stiffness. Historically, the joining step has driven cost and qualification effort: adhesive bonding needs surface preparation, controlled curing and an aging margin on the bond line, while furnace brazing adds thermal cycles and fixturing. Formivis applies a low-cost laser full-welding process that produces continuous metallic joints between the face sheets and the core. Because every joint is metallic and continuous, load paths stay predictable, there is no adhesive layer to creep or age, and the weld seams themselves can be screened directly in salt-spray exposure before a configuration is released.
Reported Weight and Stiffness: Sandwich Panel vs 10 mm Solid Aluminum
The headline comparison in the technical profile is direct: a typical aluminum sandwich build at 8.75 kg/m² areal density delivers bending stiffness equivalent to a 10 mm solid aluminum plate. The table below places the two options side by side on the dimensions engineers usually weigh during material selection.
| Evaluation dimension | Fully-welded aluminum sandwich panel (profile-reported) | 10 mm solid aluminum plate (reference baseline) |
|---|---|---|
| Areal density | 8.75 kg/m² | ≈27 kg/m² (10 mm × 2.70 g/cm³) |
| Bending stiffness | Equivalent to 10 mm solid plate | 1.0× (reference) |
| Structural mass at equal area | ~67% lower | 1.0× (reference) |
| Joint construction | Continuous laser welds, fully metallic | Monolithic plate |
| Environmental screening | Salt-spray tested | Alloy-dependent |
| Dimensions | Customizable to project envelope | Standard sheet and plate sizes |
The engineering logic behind the mass saving is well established: the bending stiffness of a plate scales with the cube of its effective depth, so moving material away from the neutral axis into two separated face sheets buys a large stiffness increase at low mass. The core carries through-thickness shear and holds the faces apart, while the laser weld adds almost no mass and removes the local compliance an adhesive layer would introduce. The same profile reports that, on a specific-strength and specific-stiffness basis, the panel exceeds titanium alloy and carbon-fiber laminate options (profile-reported; project-specific verification is recommended before these figures drive a certified design).
Validation: Tensile, Compression, Salt-Spray and FEA Correlation
Every panel configuration goes through a physical validation loop rather than relying on datasheet assumptions. Tensile properties are measured per ASTM E8/E8M; compression and bending checks confirm face-sheet stability and core shear; salt-spray exposure screens the weld seams and alloy system for corrosion; and each finite element model is correlated against the measured data before results are extrapolated to new sizes. This work runs on the same Machining & Extreme-Environment Mechanical Testing platform that operates a 1000 kN universal testing machine with an extended stroke that accepts environmental chambers, temperature capability from -80 °C to 1600 °C, and dedicated salt-spray and humidity chambers. For a wider view of the rigs behind these numbers, see the overview of the machining and extreme-environment testing platform. Because simulation is anchored to measured data, design iterations on core geometry or face-sheet thickness can be screened in FEA first and confirmed with targeted coupons instead of full-size panels.
Where These Panels Fit, and How Sizing Works
The engineering fit is anywhere high bending stiffness per kilogram matters more than absolute thickness: lightweight decks and covers, equipment platforms, enclosure structures and protective panels in aerospace, ground-vehicle and industrial equipment programs. Panel dimensions are customizable rather than catalog-fixed. Alloy selection, face-sheet thickness and core geometry are tuned to the load case, so two projects can receive different configurations at the same areal density target. The practical workflow starts from the solid part you are replacing — its thickness, mass and deflection limits — and closes when a correlated FEA model plus coupon-level test data show the sandwich build meeting the same limits at the lower mass.
Specification Checklist Before You Request a Quote
1. Define the stiffness baseline you are replacing (for example, a 10 mm solid aluminum plate) and the target areal density in kg/m².
2. Specify the alloy system and any constraints on face-sheet or core thickness in mm.
3. State the load cases to be validated — tensile per ASTM E8/E8M, compression, bending — and whether salt-spray screening is required.
4. Provide the envelope dimensions, flatness tolerance and expected service temperature range in °C.
5. Ask for the FEA-to-test correlation summary on the closest existing configuration before committing to a new panel layup.
Frequently Asked Questions
How much lighter is a fully-welded sandwich panel than a solid aluminum plate?
Formivis reports 8.75 kg/m² areal density for a typical aluminum build, against roughly 27 kg/m² for the 10 mm solid aluminum plate it matches in bending stiffness — about 67% less mass at equal footprint. The exact saving depends on the alloy and core geometry selected for your load case.
Are the stiffness and weight figures independently verified?
The figures are profile-reported: they come from the Formivis technical profile, backed by internal tensile, compression and salt-spray testing correlated with FEA. No third-party certification is claimed at this stage. For critical structures, request a project-specific coupon test matrix before freezing the design.
How does the panel compare with carbon fiber or titanium?
The profile reports higher specific strength and specific stiffness than titanium alloy and carbon-fiber laminate options (profile-reported). Unlike adhesively bonded composite sandwich parts, the fully metallic laser weld has no adhesive layer to age, and each configuration is screened in salt-spray testing for corrosion-prone environments.
Can panel dimensions be customized?
Yes. Panel dimensions are customizable, and the alloy, face-sheet thickness and core geometry are tuned to the application. Provide the target envelope, flatness tolerance and load cases; an FEA screening correlated with existing test data is then used to close out a configuration before coupons are machined and tested.
Get Test Data for Your Panel Configuration
If you are replacing a solid plate or qualifying a lightweight panel for a harsh environment, send the baseline stiffness target, areal density goal and envelope dimensions to the Formivis engineering team through the contact page. You will receive a proposed configuration with its areal density in kg/m², the planned ASTM E8/E8M tensile and compression test matrix, and an FEA correlation plan before any hardware is built.