handheld extruder welding device for welding thermoplastic synthetic materials , including an extruder screw , a drive system for the extruder screw in an axial extension of the extruder screw , and a hot air unit with a blower , where the blower and the drive system are integrated in a housing including several parts , and where a cooling body with air inlets is located on the housing on the screw side . this cooling body transfers the axial and radial forces between the drive system and the screw cylinder and supports the housing . in this handheld extruder welding device , all drive components are integrated in one housing which makes it suitable for robust use and a long service life . its design with a cooling body as the support base for the entire device represents a special function .