Geomembrane sheet welding devices are produced from non-polar thermoplastic polymer, which is chemically very stable. These devices form a melting point above 140 degrees Celsius. Therefore, it can be extruded at approximately 200°C. Geomembrane welding machine In practice, geomembranes cannot be bonded by chemical processes and welding by thermal process of a bonding technology must be done. It defines the welding of thermoplastic polymers as "joining with the use of heat and preheat or without the use of auxiliary materials." The surface is heated to a temperature above the melting point and pressurized. So that the connection is as uniform as possible. Therefore, the process of using the geomembrane welding machine includes a thermal process. For the following it is only important that the thermal process is carried out using a heat and the rheological process of the melt flow is controlled using an external force. Depending on how the welding process is done in terms of process engineering, these two processes can occur simultaneously or proceed sequentially. Basically, there are different welding methods (extrusion fillet welding, flat extrusion welding, hot wedge welding and hot air welding) and corresponding types of seams (extrusion fillet seams, extrusion flat seams, hot wedge seams and hot air seams). However, large area welding is possible, mainly using hot wedge welding or extrusion fillet welding. Hot wedge welding usually creates two parallel seams with a channel between them, while extrusion fillet welding provides extruded fillet seams. Relevant instructions for welding technology and related methods that describe the state of the geomembrane welding machine. The working conditions of geomembrane welding devices and welding seams are described in the instructions for joining cover membranes made of polymer materials in geotechnical and hydraulic applications: Requirements for geomembrane welding devices, joining cover membranes made of polymer materials (geomembranes) in geotechnical applications and hydraulic - welding, glue connection and welding.