The present invention relates to an adhesive thread device for producing an adhesive thread, comprising a supply means for supplying an adhesive-free crude thread, an adhesive tank for receiving and storing an adhesive granulate, a main heater arranged at a lower portion of the adhesive tank to define an activation zone of the adhesive tank in which the adhesive granulate is surface-melted, a closed receptacle substantially horizontally arranged, which is arranged at the activation zone of the adhesive tank with a first end, wherein the closed receptacle comprises at least one inlet opening for supplying, and at least one outlet opening for withdrawing the crude thread, and wherein, when passing the crude thread through the closed receptacle, the crude thread is wetted with adhesive on its entire outer surface in an oxidation-free manner. Furthermore, the present invention relates to a device for joining workpieces as well as a method for producing an adhesive thread and a method for joining workpieces.