ELECTRON BEAM WELDER CONTROL

摘要

In a control for an electron beam welder joining two materials along a weld line, strips of material which emit radiation of different specific wavelengths during welding are placed either side of the weld line. Sensors produce primary output signals proportional in magnitude to the radiation emitted by the respective strip materials. The primary output from one sensor is subtracted from that from the other sensor in a difference unit to generate an output signal having a null value when the emissions are equal. Circuitry may be provided to position the beam in response to the output.