Welding HDPE or LLDPE geomembranes in large-scale waterproofing projects where the watertight integrity of every meter of seam is audited with pressure testing and required by contractual specification, without resorting to manual sealing with a hot air gun that wastes days on large plots, requires a hot wedge welder with motorized traction, calibrated thermal control, and an air channel for subsequent testing. This hot wedge welding machine—also known as a hot wedge welder, double seam welder, or traction heat fuser—is manufactured by KORWINS in two power ratings (800 W and 1800 W), designed for geosynthetic contractors, professional waterproofers, and hydraulic projects with watertightness auditing.
Key Benefits
- Double seam with air channel for auditing: the wedge melts two parallel lines, leaving a central channel that is subsequently pressurized with a needle manometer to verify the watertightness of the entire seam, a condition audited in professional hydraulic projects and contracts with mining companies or environmental authorities.
- Motorized constant advance traction: the roller system pulls the machine over the geomembrane at a uniform calibrated speed, ensuring homogeneous thermal exposure and eliminating human speed variability, a condition for consistent quality welding.
- Digital or analog thermal control: calibrated system to maintain wedge temperature within the melting range of the specific material (HDPE 2-2.5 mm requires a different range than thin LLDPE), a critical condition for joints with mechanical resistance of the original sheet.
- Robust construction for field work: resistant alloy casing against dust, ambient humidity, and rough handling in quarries or landfills, sized for years of continuous intensive use.
- Two power ratings for project scale: 800 W for welding light geomembrane (1-1.5 mm in agricultural applications and small reservoirs) and 1800 W for heavy structural HDPE (2-2.5 mm in dams, landfills, and mining).
Typical Applications and Uses
- Installation of geomembrane in dams, agricultural reservoirs, artificial lakes, and large-scale water storage.
- Sealing of sanitary landfills and landfill cells with environmental auditing.
- Waterproofing of tunnels, wet foundations, and underground hydraulic retention works.
- Covering green roofs, landscaping, and industrial pools with large-format membrane.
Quality and Durability
An economical wedge welder fails in two areas: the wedge temperature is not stable during advancement (which produces areas with insufficient melting that fail the pressure test) and the motorized traction system gives out after a few months of use (which forces the operator back to manual advancement with inconsistent quality). KORWINS works with calibrated thermal control and robust motorized traction, which separates an auditable project hot wedge welder from a generic machine that produces dubious seams.
What types of projects make this machine essential compared to manual welding?
Any project with watertightness audit and significant linear seam length. Critical applications: agricultural dams and reservoirs with geomembrane over 1 hectare, sanitary landfills under environmental regulation, tunnel waterproofing and hydraulic works under contractual audit, mining with leaching cells requiring mandatory pressure testing. The hot wedge with double bead allows testing every meter of seam with a needle pressure gauge, an auditable condition that the manual hot-air gun cannot provide. For small residential projects, hot air remains the economical tool.
What conditions must the material meet for a sound weld?
The edges to be welded must be completely dry and free of dust, soil, oil, and moisture. Dirty or damp surfaces produce bubbles in the seam and zones of incomplete fusion that fail under pressure testing. In addition, Caribbean ambient temperature at peak hours can affect the wedge's thermal setting (midday with intense sun requires a different calibration than a cloudy day). The material to be welded must be the same type of polymer (HDPE with HDPE, LLDPE with LLDPE); welding between different polymers does not produce consistent molecular fusion.
How does performance differ between the 800 W and 1800 W models?
The difference is travel speed and thickness capacity. The 800 W model performs well with light geomembrane (LLDPE 1-1.5 mm, thin PVC) used in agricultural reservoirs, small ponds and moderately scaled residential projects. The 1800 W is necessary for 2-2.5 mm structural HDPE in dams, sanitary landfills and heavy hydraulic works, and allows significantly higher travel speeds on standard geomembrane, reducing total installation time. For professional contractors with a continuous flow of large jobs, the 1800 W pays back the investment much faster.
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| Dimensiones y formato | |
|---|---|
| Weight | 5 kg / 10 kg (11.02 lb / 22.05 lb) |
| Overlap width | 10 cm (3.94 in) |
| Weld width | 12.5 mm x 2 (0.49 in x 2) |
| Inner cavity | 12 mm (0.47 in) |
| Product dimensions | 40 x 25 x 28 cm (15.75 x 9.84 x 11.02 in) |
| Resistencias y rendimiento | |
| Seam strength | ≥85% of base material |
| Sistema eléctrico y motor | |
| Voltage | 220V-230V |
| Power | 800W |
| Insulation class | Class II |
| Heating temperature | 0-450°C (32-842°F) |
| Welding speed | 0.5-5 m/min (1.64-16.4 ft/min) |
| Compatibilidad y uso | |
| Material thickness to weld | 0.2 mm-1.0 mm (0.008 in-0.039 in) |
Official KORWINS warranty
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Confirmado el defecto: sustitución o devolución del valor pagado.
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