Custom-engineered fenestration solutions featuring continuous TIG/MIG Sigma-welded corner joints, optimized for Czech residential, commercial, and passive house specifications.
A technical engineering comparative evaluation of continuous arc welding vs. traditional mechanical crimping under Central European climatic cycles.
In structural window manufacturing, the corner joint is the single critical point of failure. Traditional aluminum window manufacturing relies heavily on mechanical corner cleats, screwed fasteners, and cold-crimp corner joints combined with liquid corner sealants. While economical for mild climates, mechanical joinery degrades under Central Europe's harsh freeze-thaw cycles.
Our proprietary Sigma Welding Process utilizes inert gas shielded arc welding (TIG/MIG) to molecularly fuse 6063-T6 aluminum extrusion corners. By liquifying the alloy interface with matching 4043 or 5356 filler wire, the mitered joint transitions from two distinct pieces into a single, seamless metallic structure.
Once dressed smooth, a Sigma-welded joint eliminates the micro-gaps that develop in mechanical corners over time, preventing thermal expansion fatigue, water ingress, and structural sagging under heavy triple-pane glazing packages.
| Performance Parameter | Mechanical Crimped | Sigma Welded (TIG/MIG) |
|---|---|---|
| Joint Tensile Strength | 140 - 180 MPa (Cleat bound) | 240 - 290 MPa (Monolithic) |
| Water Infiltration (EN 12208) | Class 7A - Class 9A | Class E1500 (Watertight) |
| Air Permeability (EN 12207) | Class 3 (Degrades over time) | Class 4 (Zero Degradation) |
| Corner Deflection (Heavy Glaze) | 1.5 mm - 3.2 mm racking | 0.00 mm (Rigid Structural) |
| Freeze-Thaw Durability | Sealant cracks at -15°C | Immune (-50°C to +90°C) |
From historic urban restorations in Prague to high-altitude alpine residences in the Krkonoše Mountains, our OEM/ODM custom aluminum fabrications conform precisely to Czech local conditions.
Strict historical preservation zones (Památková péče) in Prague demand ultra-thin frame sightlines, high acoustic damping against tram noise, and precise architectural color matching.
Severe winter conditions in the Czech border mountain ranges demand structural resilience against high wind pressures, heavy snow loading, and extreme thermal gradients.
Modern office complexes and industrial centers require durable tilt-and-turn fenestration and heavy-duty sliding doors designed for high traffic and large structural spans.
Aligning OEM/ODM aluminum window manufacturing with national standards (ČSN 73 0540-2) and EU Green Deal Energy Performance Directives (EPBD).
The Czech Republic has rapidly adopted stringent thermal performance standards for residential construction. Under national standard ČSN 73 0540-2, new residential buildings targets overall window thermal transmittance ($U_w$) values below $0.85 \text{ W/m}^2\text{K}$.
Our OEM/ODM manufacturing integrates 34mm to 54mm multi-chambered thermal breaks filled with expanded polyolefin insulation (PE insulation blocks), seamlessly receiving argon-filled, warm-edge spacer triple glazing packages ($U_g = 0.5 \text{ W/m}^2\text{K}$) to effortlessly achieve $U_w \le 0.78 \text{ W/m}^2\text{K}$.
All window and door systems exported to Czech B2B procurement partners, real estate developers, and general contractors are manufactured in full compliance with European Harmonized Standard EN 14351-1.
Every crated shipment includes complete Factory Production Control (FPC) documentation, Declaration of Performance (DoP), and full traceability of raw aluminum extrusions, ensuring frictionless municipal approval and building sign-offs throughout Czech municipalities.
We work directly from architect submittal drawings, delivering bespoke profiles, precision corner welding, and pre-glazed assemblies tailored to exact project schedules.
Primary extrusion members are manufactured strictly from 6063-T6 architectural grade aluminum alloy, delivering optimal structural yield strength, exceptional corrosion resistance, and flawless anodizing/powder coating adhesion.
Frame members, sashes, and heavy-duty door panels are Sigma welded at every joint. Automated pneumatic jigs align miters to sub-millimeter tolerances before inert gas welding, followed by precision CNC corner dressing.
Choose from AkzoNobel or PPG Qualicoat Class 2 fluorocarbon (PVDF) spray coatings, ultra-durable architectural powder coatings, or anodized finishes engineered to resist high UV and atmospheric industrial pollution.
Factory-installed double or triple glazing packages incorporating Low-E coatings, warm edge silicone spacers, and acoustic laminated glass options filled with 90%+ pure argon gas.
Two engineered insect screen designs—flat frame and long-leg frame—built from roll-formed aluminum framing with 16x18 charcoal fiberglass mesh retained by heavy vinyl splines.
Our dedicated engineering department converts client elevations or CAD schedules into unit-by-unit shop submittals detailing net dimensions, glass bites, swing directions, and flashing interfaces prior to extrusion cutting.
Expert guidance on technical specifications, international logistics, custom manufacturing, and engineering compliance.
Solid 6063-T6 aluminum frames with continuous Sigma-welded joints form a monolithic metal structure. Unlike mechanical crimping which uses internal cleats and liquid corner glues, a welded corner cannot loosen, rack, or create water leakage pathways under extreme thermal movement or wind load over decades of operational service.
Our thermally broken aluminum systems, combined with 48mm triple-pane Low-E glass ($U_g = 0.5 \text{ W/m}^2\text{K}$) and warm-edge technology, achieve overall window $U_w$ values as low as $0.78 \text{ W/m}^2\text{K}$. This fully satisfies the Czech Republic's Passive House (Nízkoenergetické domy) energy code regulations under ČSN 73 0540-2.
Every window unit is individually labeled to correspond with architectural submittal drawings, fitted with protective corner caps, wrapped in vapor-barrier film, and packed into ISPM-15 certified export wooden crates. We manage container loading and provide complete customs documentation for seamless arrival at Prague, Brno, or Pilsen job sites.
Yes. Custom OEM/ODM manufacturing is our core strength. We build 100% to order based on your submittal drawings or site measurements. There are no standardized stock size constraints, allowing us to fabricate oversized sliding doors, curtain wall modules, or custom-curved head casements.
Yes. Aluminum naturally resists oxide corrosion far superiorly to raw steel. For maximum exterior durability, we supply Qualicoat Class 2 powder coatings and PVDF architectural finishes tested against salt spray, atmospheric sulfur pollution, and freezing moisture condensation.
We integrate high-grade European-standard hardware systems (including Siegenia, Roto, or custom commercial concealed hinges) with multi-point perimeter locking, anti-burglary mushrooms, and tilt-ventilation options ensuring long service life and high operational safety.
With over six decades of dedicated aluminum fabrication experience since 1962, our factory operates on uncompromising metallurgical and engineering principles. We bridge the gap between custom architectural design and industrial mass-precision manufacturing.
Decades of field-tested fabrication experience inform every miter cut, weld bead, sealant joint, and hardware mounting detail that leaves our shop floor.
We do not utilize timber or petroleum-based vinyl (uPVC) framing materials. 6063-T6 aluminum is 100% recyclable, dimensionally stable under intense heat, and structurally permanent.
Every fenestration unit is checked for squareness, operational smoothness, multi-point lock alignment, and seal integrity before being crated for export shipping.
