1) Measured with an insert thermometer at the exrudate outlet of the hand extruder.
2) Measured 5mm in the nozzle, in the centre of the nozzle opening.
3) Drawn-in cold air volume at the ambient pressure.
4) PE 63, PE 80, PE 100
5) Depending on the preheating
6) LEISTER empiric parameters
7) Welding rod has to be pre-dryed

Please note:
The indicated welding parameter may vary depending on the ambient temperature and the material configuration. Test welds need to be done and the parameter aligned accordingly! Leister takes no responsibility for poor quality welding!

1) Measured 5mm in the nozzle, in the centre of the nozzle opening.
2) Drawn-in cold air volume at the ambient pressure.
3) Depending on the welding filler material diameter and the welding groove geometry.
4) PE 63, PE 80, PE 100
5) Nitrogene recommended
6) LEISTER empiric parameters

Please note:
The indicated welding parameter may vary depending on the ambient temperature and the material configuration. Test welds need to be done and the parameter aligned accordingly! STANMECH takes no responsibility for poor quality welding!

We've written previously about the Advantages of a Screw Extruder for Extrusion Plastic Welding. In a screw-based extruder, the turning screw grinds up the welding rod as it passes through the barrel. Both the mechanical energy of the turning screw and heat introduced along the extrusion barrel plasticize the incoming material. The barrel can be heated either with hot air or with a coil heater. 

This initial operation video shows you—in an easy and simple way—how to set up a Leister WELDPLAST extrusion welder. The video also demonstrates how to maintain the machine in a few steps, as well as safe and secure handling of the machine.

​This initial operation video shows you—in an easy and simple way—how to set up a Leister FUSION extrusion welder. The video also demonstrates how to maintain the machine in a few steps, as well as safe and secure handling of the machine.

​Plastic extrusion welders can generally be divided into two categories: screw-based extruders and non-screw-based extruders.

In both types of extruders plastic material, typically in the form of welding rod, is fed into the unit where it is melted (plasticized) and extruded out the end of the tool.

In a screw-based extruder, the turning screw grinds up the welding rod as it passes through the barrel. Both the mechanical energy of the turning screw and heaters along the barrel of the extruder plasticize the incoming material.
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Non-screw based extruders use heaters alone to plasticize the welding material. The welding rod is pushed through the heat zone and out the end of the tool but is not ground up in the process.

Screw based extruders are the most common and have several advantages:

​There are three essential parameters for a plastic weld: temperature, pressure, and time. 

​All thermoplastics have a specific temperature range for effective welding. The plastic manufacturer can often give you an appropriate range of welding temperatures for their material. However it is important to know that the perfect welding temperature for the application can vary depending on environmental conditions such as temperature or sunlight exposure. For example, if you are plastic welding in a colder than normal environment you may need to slightly increase your welding temperature.

For hand welding, the air flow temperature is the only set point to consider. With extrusion welding there are different set points for both the air temperature and the temperature of the extruded plastic