Fitted with a brushless motor, this compact and cost-saving economic worm extruder for pre-heated air is used in process equipment manufacture and civil engineering. Instead of the brush, there is an integrated hot air blower and a screw extruder with barrel heater for heating the welding seams before work. Intelligent design of the extruder ensures noiseless operation, while promising optimal cooling of electronics and drive. The device is ideal for construction sites because it has a terminal with illuminated graphic display and keys for operation. A microprocessor helps regulate and monitor the welding process. A menu with function programs ensures operational efficiency. The air flow is up to 450 l/min. There is a twist-free welding rod with a 3mm or 4mm rod.