Abstract: A conveyor device containing transport frames, each of which is structured for receiving a printed circuit or wiring board carrying circuit components and guided at their leading and their trailing corners by related guide tracks, leads the transport frames to a solder bath, where the transport device lowers the transport frames together with the printed circuit boards towards the solder bath and again raises the same therefrom. During the course of travel of a transport frame containing a printed circuit board carrying one or more of the circuit components through the solder bath one side of the printed circuit board is immersed into the solder bath and then again lifted out of the solder bath.