Leister WeldPlast S4 (4 variants, 116.948, 146.812, 146.813, 156.451)

Product Name

Leister WeldPlast S4

Brief Description

The Leister WeldPlast S4 is a powerful, digitally regulated extrusion welding machine, also known as a hand extruder, designed for high-power plastic welding applications. It features a brushless, maintenance-free motor for generating preheated air and a robust drive system that ensures a consistent material output for demanding welding tasks. The tool incorporates microprocessor control for precise regulation of the welding process and continuous monitoring of its operational parameters.

Popular Applications & Uses

- Plastic tank fabrication- Civil engineering projects- Geomembrane welding, including landfill and mining membrane welding, and waterproofing of reservoirs and canals- Aquaculture construction and repair- Boat construction and repair- Equipment and container construction- Pipeline construction

Industries that Commonly Use It

- Plastic Fabrication- Construction/Building Services- Marine- General Manufacturing- Chemical Industry

Special and Unique Features

- Brushless, maintenance-free motor for generating preheated air- Powerful drive system ensuring a consistent output of up to 4 kg/hr- Microprocessor control for regulating the welding process and monitoring the tool- Closed-loop system for precise monitoring and control of operating temperature- Integrated temperature probe and a large display to show all operational parameters- Compact housing design that reduces noise and guarantees optimal cooling for the electronics and drive- Dual-sided, twist-free wire intake for smooth operation- Multifunction menu with pre-set function programs for ease of use- Available in variants specifically suited for equipment/container construction or civil engineering/geomembrane applications- Complies with DVS (German Welding Association) standards- Features Leister Quality System (LQS) data recording in some variants

Key Properties

- Material output: 1.5 - 4.0 kg/h (depending on welding rod diameter)- Welding rod diameter compatibility: 3-4 mm or 4-5 mm (variant dependent)- Power: 3680 W (230V)- Maximum air outlet temperature: 350°C- Maximum plastification temperature: 260°C- Weight: 8.7 kg (without power cord)- Air flow: up to 450 l/min- Screw heating: Coil heater- Air temperature control: Closed loop

Surface Compatibility

- Polyethylene (PE), including HDPE, LDPE, and LLDPE- Polypropylene (PP)

Known backups / known substitutes

- Other Leister extrusion welders: WELDPLAST S1, WELDPLAST S2, FUSION 2, FUSION 3C, WELDPLAST 600, WELDPLAST 605- Leister hot air hand tools (for smaller jobs, detailed work, or thinner plastics): TRIAC ST, HOT JET S, ELECTRON ST, GHIBLI AW, DIODE S/PID, Welding Pen, LABOR S

Comparison Note

The Leister WeldPlast S4 stands out as a heavy-duty extrusion welder, specifically engineered for welding thicker plastics (recommended for 1-25mm, with some sources indicating up to 35mm capability) and handling larger fabrication projects. Its high output of up to 4 kg/hr makes it significantly more efficient for substantial tasks compared to smaller hand tools or other compact extruders like the WELDPLAST S1 or FUSION 2, which are typically better suited for confined spaces or smaller jobs. The S4's advanced digital controls and maintenance-free brushless motor contribute to its consistent performance and reliability in demanding industrial environments.