Professional​ PVC UPVC Colorful Windows Profile CNC​ Seamless Welding Machines with 4 Servo-Controlled​ Heads

Manufactured by Lebulang Machine, which has produced window and door processing equipment at its China factory for close to 30 years, this four-head welding machine is designed for joining colorful PVC and UPVC profiles. The machine is CE and ISO certified, supports OEM and ODM orders, and is supplied directly from the factory.

The four welding heads can work synchronously or independently, letting all four corners of a frame be completed in a single cycle. A constant-temperature heating plate, controlled through a PLC, regulates heat input to avoid discoloring or damaging colored coatings and co-extruded surfaces. Welding parameters — heating time, melt depth, and pressing pressure — are stored digitally for recall. An integrated cleaning cutter built into each clamping unit trims the weld bead as part of the same cycle, producing a smooth joint that requires no manual polishing or secondary finishing.

Engineered for modern window and door manufacturers, this industrial-grade 4-head seamless welding machine delivers flawless, mark-free corners on colored PVC and UPVC profiles. Built with a reinforced steel frame and precision CNC control, it performs 4-head synchronous welding with consistent, bubble-free results. Designed to eliminate weld scars on co-extruded, laminated, and spray-coated profiles—maximizing both production speed and product aesthetics.

 

Core Advantages

No.IconTitleDescription01🎯True Seamless WeldingAdvanced welding technology produces smooth, flush corners with zero raised scars. No secondary grinding required—profiles come off the machine ready for assembly.02⚙️4-Head Synchronous OperationFour welding heads work in unison, completing multiple corners in a single cycle. Output is approximately double that of a standard 2-head machine.03🖥️CNC Precision ControlDigital control system with touchscreen HMI. Welding temperature, time, and pressure are precisely programmable for repeatable, high-quality results.04🏗️Heavy-Duty Industrial BuildHigh-strength welded steel frame with stress-relief treatment. Rigid, stable, and built for 24/7 continuous operation in demanding production environments.05🎨Optimized for Colored ProfilesCalibrated for white, dual-color co-extruded, laminated (foil), and powder-coated PVC/UPVC profiles. Ensures no discoloration, no cracking, and natural color transition at weld corners.

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Machine Parameter

Item	Technical Data
Input Voltage	220V/50Hz (Customizable as Required)
Input Power	4.5Kw
Working Air Pressure	0.5~0.8Mpa
Air Consumption	260L/min
Welding Height	20~100mm / 120mm
Welding Width	120mm
Welding Range	400~4500mm
Overall Dimension (L*W*H)	5000*1100*1700mm

Advantages of Seamless Welding for Colorful Profiles

Traditional ordinary welding machines will form obvious welding seams and white burrs on the surface of colored PVC profiles, which require secondary polishing and repair, seriously affecting production efficiency and product appearance. PVC UPVC Colorful Windows Profile Seamless Welding Machines with 4 Heads integrates welding and automatic cleaning, realizing zero-traces welding on the profile surface. The welded window frame has integrated and smooth lines, no color difference, higher corner firmness and better overall sealing and heat insulation performance, which is more in line with the high-end market demand of architectural doors and windows.

Detailed Highlights

1️⃣ Seamless Welding Process

Special-grade welding cloth: high-temperature resistant and non-stick

No secondary grinding required after welding—perfect corner seams straight from the machine

Especially suited for high-end colored windows, increasing product added value

2️⃣ Intelligent Control System

Touchscreen HMI interface—intuitive and easy parameter setting

Multiple welding recipes can be stored; one-click switching between different profiles

Self-diagnostic fault detection reduces maintenance costs

3️⃣ High-Efficiency Production Design

4 heads can be controlled independently or operated in linkage mode

Pneumatic clamping system—precise positioning and fast response

Supports continuous feeding mode, minimizing operator idle time

4️⃣ Reliable Quality Assurance

Key components from internationally renowned brands (e.g., Siemens / Schneider electrical parts)

Every machine undergoes 72-hour continuous running tests before delivery

Complete operator training and after-sales technical support provided

Applications

✅ Colored UPVC Windows — Casement, sliding, tilt-and-turn

✅ Premium Door Systems — Patio doors, French doors, bi-fold doors

✅ Dual-Color & Laminated Profiles — Co-extruded and foil-wrapped surfaces

✅ High-Volume Production — Real estate projects, export orders, OEM manufacturing

FAQ

Can this machine weld all colors of UPVC profiles?

A: Yes. Our 4-head seamless welding machine is optimized for a wide range of colored PVC/UPVC profiles, including white, dual-color co-extruded, laminated (foil-wrapped), and spray-coated profiles. The welding parameters can be adjusted to match the specific material and color, ensuring no discoloration, no cracking, and a flawless corner finish.

Q2: What is the production capacity compared to a 2-head welding machine?

A: With 4 heads operating synchronously, this machine can complete welding on 4 corners or multiple profile sections in a single cycle. In practical production, output is approximately doubled compared to a standard 2-head machine, making it ideal for manufacturers with high-volume orders.

Q3: Is the machine easy to operate for new users?

A: Absolutely. The CNC touchscreen interface is user-friendly, with preset welding recipes for common profile types. We also provide comprehensive operator training, an English instruction manual, and video tutorials to ensure your team can run the machine confidently.

Q4: What after-sales service do you provide?

A: We offer a [12-month] warranty, lifetime technical support, and remote diagnostics via video call. Spare parts are available for express shipping worldwide. Our engineering team responds to service inquiries within 24 hours.

Q5: Can the machine be customized for our specific profile sizes?

A: Yes, we provide customization options for welding range, head spacing, and clamping fixtures based on your profile specifications. Please send us your profile drawings or samples, and we will recommend the best configuration.