Lab 03
RF Welding Center
Dielectric bonding technology for welds that hold under pressure
An inflatable SUP is only as reliable as its seams. A single weak weld can compromise an entire chamber — and at sea, a chamber failure is not an inconvenience; it is a safety hazard. At Afarer, we have invested in a dedicated Radio-Frequency (RF) Welding Center that combines industrial-grade dielectric welding presses with rigorous process control and post-weld testing. Every seam we produce is documented, traceable, and certified to meet or exceed the requirements of EN ISO 25649 — the European standard for inflatable leisure equipment.
The science behind the seam
RF welding uses high-frequency electromagnetic energy (typically 27.12 MHz) to excite the polar molecules within PVC-coated fabric, generating heat precisely at the material interface. Unlike hot-air or hot-wedge welding, RF welding creates a true molecular bond — the two fabric layers fuse into a single homogeneous material at the weld zone, producing a joint that is as strong as the parent material itself.
Welding equipment and process control
Our welding centre is equipped with:
| Machine | Power / Capacity | Application |
|---|---|---|
| Dielectric RF press 1 | 15 kW, platen 2000 × 600 mm | Main longitudinal seams, rail-to-hull joints |
| Dielectric RF press 2 | 10 kW, platen 1500 × 500 mm | Baffle welds, rail closure joints, valve patches |
| CNC controlled RF welder | 8 kW, XY table 2500 × 1200 mm | Curved seams, logo/panel embossing, precision patchwork |
| Hot-wedge automatic welder | Variable temperature, 1.2 m/min max | Backup method for thick PVC rail fabric and repair work |
Every RF press is equipped with closed-loop temperature and pressure monitoring. Weld parameters — power, press time, cooling time, electrode pressure — are programmed per material type and recorded in our Manufacturing Execution System (MES) for full traceability.
Weld quality tests — every seam, every board
Weld integrity is verified through a mandatory four-test protocol:
- Visual inspection — 100 % of seams are visually inspected for burn-through, misalignment, contamination, or incomplete fusion. Reject rate threshold: 0.5 % of linear metres.
- Peel test — A 25 mm wide strip is cut from a test coupon welded with each production batch. Minimum peel force: 120 N/25 mm for PVC 1100 dtex.
- Air-retention test — Every completed chamber is pressurised to 1.5 × working pressure and held for 30 minutes. Pressure drop must not exceed 2 %.
- Thermal cycling test — Sample coupons are cycled from -20 °C to +60 °C for 50 cycles, then peel-tested again. Acceptable strength loss: < 10 %.
Peel Strength Comparison — RF vs Hot-Air Welding (PVC 1100 dtex)
RF welding consistently achieves 90-95 % of parent-material strength, well above the minimum.
Professional expertise
Our welding team is led by a senior process engineer with 11 years of experience in dielectric welding of coated textiles. Each operator completes a 6-month in-house certification programme before being allowed to work on production seams. Recertification is required annually, including a practical weld test evaluated against our internal Grade-A standard (peel strength ≥ 160 N/25 mm).
Custom welding solutions for unique requirements
We understand that one welding specification does not fit every application. Our RF Welding Center routinely develops custom seam configurations for clients with special requirements:
- Multi-layer reinforcement patches — for high-wear areas such as the nose and tail rails, we develop multi-pass RF welds that integrate a wear-resistant outer layer without compromising flexibility.
- Conductive or RF-opaque seams — for military or surveillance applications requiring electromagnetic shielding, we weld in conductive mesh layers within the seam stack-up.
- Colour-change panel welding — dual-colour fabric panels (e.g. orange hull + grey deck) welded with a concealed overlap to maintain brand aesthetics without a visible join line.
Our commitment to you
Every board we deliver carries our weld-quality guarantee: if any seam fails in normal service within the warranty period, we repair or replace the affected chamber at no cost, and a root-cause investigation is performed to prevent recurrence. This is not simply a warranty — it is a commitment to continuous improvement driven by real-world operational data.
When you choose Afarer, you are choosing seams that are engineered, tested, and documented — not just welded. That is the difference between a board that floats and a board that performs.
Discuss your welding requirements
Custom seam specifications, material compatibility, or process validation.
Contact our welding team