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CNC Four-Corner Head UPVC Welding Machine

The CNC Four-Corner UPVC Welding Machine is engineered for high-precision PVC/UPVC window and door frame welding, completing all four corners in a single cycle. With CNC-controlled temperature, pressure, and timing, it achieves stable weld consistency and frame squareness within ±0.2 mm, significantly improving efficiency and reducing post-weld correction in mass production.

Total Power: 9 kW
Air Pressure: 0.7 MPa
Welding Angle: 90°

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Description

Simultaneous Four-Corner Welding

Designed for ultimate efficiency, the machine simultaneously melts and joins all four corners of a UPVC frame in one automated cycle. This guarantees perfect squareness and dimensional accuracy, eliminating the cumulative errors commonly found in traditional single or double-head welding processes.

Seamless & Standard Welding Switch

Instantly switch between 0.2mm seamless and standard welding modes. This versatile function protects the high-performance alloy knives from premature wear during standard operations, while ensuring exceptionally flat, uniform weld flashes that simplify your downstream CNC corner cleaning.

Low-Pressure Precision Clamping

Operating on an optimized low air pressure of just 0.2-0.3Mpa, it securely holds the material without causing profile deformation. The CNC-machined aluminum clamp plates and patented one-piece upper clamp design guarantee ultra-smooth, high-precision carriage movement.

Automated Cooling & Slag Removal

A patented air-cooling system rapidly solidifies all four welded corners simultaneously to boost production speed. Meanwhile, the automated dust and slag blowing function instantly clears away debris, entirely eliminating the need for manual scraping and keeping the workspace spotless.

Advantages &Features

01

The CNC Four-Corner Welding Machine achieves higher frame squareness by welding all corners simultaneously under identical thermal and pressure conditions.

02

Single-cycle four-corner welding reduces total welding time by up to 50% compared with traditional two-head welding processes.

03

CNC parameter control ensures stable weld penetration and surface consistency, reducing weld defects and minimizing post-processing work.

04

Balanced horizontal clamping significantly lowers the risk of profile distortion during heating and cooling stages.

05

The machine supports continuous industrial operation with consistent welding quality across long production runs.

06

Improved welding accuracy reduces downstream correction, directly increasing assembly efficiency and overall production yield.

Parameter

Product Parameter

Parameter	Specification
Max Profile Length	6,000–6,500 mm (standard UPVC extrusion length)
Cutting Angles	45° / 90° standard, optional multi-angle configuration
Cutting Accuracy	Within ±0.5 mm over long runs
Dust Extraction	Dual ports Ø 120–150 mm, supports central dust system
Air Supply	0.6–0.8 MPa compressed air
Power Supply	380V / 50Hz, optional 220V / 60Hz
Machine Dimensions	Length 4.5–6.5 m, width 0.8–1.2 m, height 1.5–1.8 m

FAQ

How much faster is this CNC Four-Corner Welding Machine compared to a double-head welder?

Because it welds all four corners of the window sash or frame simultaneously in a single cycle, it effectively doubles your production capacity and ensures mathematically perfect 90-degree corners without requiring the operator to manually flip and re-clamp the profile.

How does four-corner welding improve frame accuracy?

By welding all corners at the same time, the machine eliminates cumulative alignment errors that often occur in sequential two-corner welding.

Why does this welder operate on such a low air pressure (0.2-0.3Mpa)?

Our advanced mechanical transmission design achieves superior clamping force at much lower pressures. This prevents the UPVC profiles from bending or bowing under heavy pressure, ensuring a perfectly flat window frame and extending the machine’s mechanical lifespan.

Is it difficult to change the extrusion knives when switching to a different profile brand?

It’s incredibly user-friendly. The equipment features a standardized, interchangeable 4-tool design. Operators can quickly switch setups for different window profiles in minutes, lowering your overall tooling inventory costs and minimizing setup time.

How does the automatic cleaning feature handle the leftover welding slag?

The machine is equipped with a patented air-cooling and automated blowing system. It rapidly cools the weld joints and uses precise, high-pressure air blasts to automatically clear away the slag, entirely eliminating manual cleanup by your staff.

Does the machine require constant oiling or special maintenance for the guide rails?

No. We utilize widened, high-grade linear square rail bearings designed for long-term, heavy-duty use. They run with high precision and require absolutely no special daily lubrication, ensuring your factory floor remains clean and highly productive.