The Schtec WM 740 - WM 750 Welding Machine

WM 740 Four Head Welding Machine

Name: WM 740 Four Head Welding Machine
Brand: Schtec
SKU: WM-740

Schtec WM 740 auto-welds four PVC corners at 90° for high volume production. Features Beckhoff PC, 15” touchscreen, PID heat control, and roll type Teflon system.

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SKU: WM-740

Category: Welding Machines

Welds four corners of PVC profiles simultaneously at 90 °with high sensitivity and strength
Beckhoff brand, high performance industrial PC operated by Windows XP Embedded. Fanless motherboard system works between 0°C – 55°C, and it comes with a 15” touch screen display
Data transfer via ethernet network connection, wireless network connection or USB interface
Welding parameters are defined by the user for every individual profile(up to 10,000 profiles)
Welding temperature, melting and welding times can be adjusted individually for each profile type.
All machine axes are moved by hardened steel ball screw which provides accuracy and durability.
PC controlled (PID) heat control system to obtain strong welding results in compliance with standards.
Summer / winter working mode is automatically selected,so the temperature adjustment is done easily
Horizontally placed strong mechanical heating plates distribute heat homogeneously without being affected from difficult working conditions.
Easy and fast change for teflons by specially designed roll up teflon system.
Easy and fast change for welding moulds
Works effectively by compressed air supplied to the system
White or colour profiles can be weld with the same sensitivity
Central lubrication system minimizes maintenance time
Reports can be created for daily, weekly, monthly and annual production
Light barriers and safety equipment confors to CE machine design with full security
Stable and accurate data transfer between this machine and the CNC corner cleaning machine via Industrial quality Ethernet connection
All the error messages and system status can observed on screen by HMI software program developed by the Schtec software department
Service to the entire automation system,trouble shooting and fault removals can be done by remote connection

Optional Features

Gasket pressing system (GR 930)
Barcode reader (BR 920)

Product Description

The Schtec WM 740 automatically welds all four corners of PVC window and door profiles at 90° angles. Fully automated, it delivers high efficiency for large-scale production. It includes a Beckhoff industrial PC with a 15” touchscreen, PID heat control for stable seasonal performance, a 10,000-profile memory bank, and wireless/Ethernet data integration. The roll-type Teflon change system and centralized lubrication reduce maintenance time. WM 740 is designed for speed, precision, and safety in high-volume manufacturing.

Frequently Asked Questions

Find quick answers to common questions about our Welding Machines.

1. What is the main purpose of a welding machine in PVC manufacturing?

Welding machines like WM 750 Four Head Welding Machine and WD 710 Single Head Welding Machine are used to fuse PVC profile corners by melting material, creating seamless and durable frames. They eliminate the need for mechanical fasteners and ensure air‑ and water‑tight joints. Consistent heat control and pressure maintain structural integrity and appearance over many cycles. In automated lines, welding machines coordinate with cleaning and cutting stations for full process flow.

2. What features should you expect in a high‑performance PVC welding machine?

High‑performance welding machines typically feature servo‑driven axes, parallel welding systems for balanced pressure, PID temperature controllers, and mold parameter storage for multiple profile types. Rapid mold changeover, central lubrication, and Teflon handling systems reduce maintenance downtime. Safety enclosures, light barriers, and efficient air management are also essential. Robust user interfaces and remote diagnostics enhance usability and monitoring.

3. How does the WM 750 Four Head Welding Machine boost productivity?

The WDV 724 is ideal for continuous inline production environments where profiles move through the machine, welding in a flow setup. The WD 720 Double Head Welding Machine is suitable when moderate capacity and flexibility are needed, allowing two corners to be welded simultaneously. Single head machines like WD 710 are good for smaller runs or limited footprint setups. Four‑head machines like WM 740 are preferred for highest throughput in batch production.

4. When would you choose WDV 724 Four Head Inline Welding Machine or WD 720 Double Head Welding Machine?

5. What maintenance practices ensure durable performance in welding machines?

Clean welding platens, remove residue, and inspect Teflon surfaces regularly to prevent imperfections. Calibrate temperature sensors, PID controls, and servo axes periodically to preserve accuracy. Check pneumatic lines, seals, and air pressure to maintain consistent force during welding. Lubricate motion components and adhere to central lubrication schedules. Monitor error logs, evaluate weld quality, and schedule preventive services to avoid unplanned downtime.

Power Supply	400 V, 3ph, 50-60 Hz
Power Consumption	11.5 kW, 28.75 A
Max. Welding Length	4.100 mm x 2.600 mm
Min. Welding Length	450 mm x 450 mm
Min. Welding Length (with gasket pressing)	520 mm x 570 mm
Max. Profile Height	180 mm
Min. Profile Height	40 mm
Max. Profile Width	120 mm
Air Pressure	6-8 bar
Air Consumption	70 lt./min.
Machine Height	1.880 mm
Machine Length	5.875 mm
Machine Width	4.100 mm
Machine Weight	1.920 kg

WM 740 Four Head Welding Machine

Standard Features