Electric heating – Metal heating – By arc
Patent
1976-08-24
1978-11-28
Truhe, J. V.
Electric heating
Metal heating
By arc
B23K 900
Patent
active
041277627
ABSTRACT:
In the course of welding measurements are taken of the concentration of metallic vapor in the cloud of vapor over the welding zone, the diameter of the hot spot on the article being welded being kept constant. Said concentration serves as an indication of the depth of fusion. The metallic vapor concentration is measured with the aid of a device comprising an electron quantity transducer, for example, a beam trap, with an electric filter connected to its output, said electric filter separating electric waves of frequencies upwards of 200 Hz. The alternating component thus separated is converted into d-c voltage and compared to a reference signal in a comparison circuit, upon which the electron beam current of the gun is altered, depending on the value of the error signal of said comparison circuit. The depth of fusion is found by way of changing the value of the output signal of the rectifier.
REFERENCES:
patent: 3196246 (1965-07-01), El-Kareh
patent: 3347701 (1967-10-01), Yamagishi et al.
patent: 3426174 (1969-02-01), Graham et al.
patent: 3558880 (1971-01-01), Kniseley
patent: 3609288 (1971-09-01), Sciaky
patent: 3612859 (1971-10-01), Schumacher
patent: 3691341 (1972-09-01), Roiron
Lebedev Vladimir K.
Obolonsky Alexei P.
Paton Boris E.
Podola Nikolai V.
Bell Fred E.
Truhe J. V.
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