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Patent

Electric arc welding

28 Dec 1951-
TL;DR: In this article, the high-frequency inductor or transformer disposed in the welding circuit and necessary for the injection of the highfrequency current has a core of ferrite material or powdered iron and is arranged to saturate at normal welding currents so as to offer little impedance to the flow of welding current.
Abstract: 722,494. Supply systems for welding arcs. AIR REDUCTION CO., Inc. Dec. 8, 1952 [Dec. 28, 1951], No. 31074/52. Drawings to Specification. Class 38 (4). To permit the employment of a relatively low high-frequency (say 50 to 500 kcs. per sec.) current for starting and stabilizing a D.C. or low-frequency A.C. welding arc, the highfrequency inductor or transformer disposed in the welding circuit and necessary for the injection of the high-frequency current has a core of ferrite material or powdered iron and is arranged to saturate at normal welding currents so as to offer little impedance to the flow of welding current, but to be unsaturated by the high-frequency currents alone, so as to offer high impedance to these-and thus provide good injection of high-frequency currentwhen the arc extinguishes. The high-frequency generator may comprise a push-pull valve oscillator normally cut off by external bias, but triggered into oscillation by a voltage pulse induced in a winding of the injection transformer upon interruption of the flow of welding current.
Citations
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Journal ArticleDOI
TL;DR: In this paper, back-propagation neural networks are used to associate welding process variables with the features of the bead geometry and penetration, and the results of these experiments show a small error percentage difference between the estimated and experimental values.

261 citations

Patent
08 Jul 1981
TL;DR: In this article, a pulse arc welding machine is presented, where a pulse peak current supplying circuit is connected in series with an arcing region formed between a consumable wire electrode and a material to be welded between the output terminals of a standard direct current source.
Abstract: A pulse arc welding machine in which the repetition frequency of the pulse currect is unaffected by the frequency of the power source and the mean value of the pulse current applied can be accurately controlled over a broad range while the arcing is maintained stable. A pulse peak current supplying circuit is connected in series with an arcing region formed between a consumable wire electrode and a material to be welded between the output terminals of a standard direct current source while a base current supplying circuit is connected in parallel with the pulse peak current supplying circuit. The pulse peak current supplying circuit and the base current supplying circuit are both composed of a switching element such as a transistor coupled in series with an inductive element. Diodes are provided for suppressing high voltage transients in the circuit.

141 citations

Patent
24 May 1956

126 citations

Patent
23 Mar 2015
TL;DR: In this article, a method and system to manufacture workpieces employing a high intensity energy source to create a puddle and at least one resistively heated wire which is heated to at or near its melting temperature and deposited into the puddle as droplets.
Abstract: A method and system to manufacture workpieces employing a high intensity energy source to create a puddle and at least one resistively heated wire which is heated to at or near its melting temperature and deposited into the puddle as droplets.

77 citations

Patent
30 Jul 1982
TL;DR: In this article, an ignition system for a multi-cylinder internal combustion engine eliminates high-voltage cables and a mechanical distributor in order to reduce electrical power losses due to joule effect caused mainly by the high voltage circuit, comprises a plurality of ignition coils and plugs, one provided for each cylinder, a distribution unit for distributing advance-angle control signals into the respective cylinders, and a booster for boosting the supply voltage to reduce the size of the ignition coil.
Abstract: An ignition system for a multi-cylinder internal combustion engine eliminates high-voltage cables and a mechanical distributor in order to reduce electrical power losses due to joule effect caused mainly by the high voltage circuit, comprises a plurality of ignition coils and plugs, one provided for each cylinder, a distribution unit for distributing advance-angle control signals into the respective cylinders, and a booster for boosting the supply voltage in order to reduce the size of the ignition coil, in addition to the conventional ignition system. Furthermore, the ignition coil can be built integrally with the ignition plug for eliminating high-voltage cables connected between coil and plug.

61 citations

References
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Patent
26 Jan 1923
TL;DR: In this article, a method for the liquefaction and separation of ternary gaseous mixtures for the purpose of recovering the constituents of air is described, particularly adapted for the separation of the principal constituents.
Abstract: This invention relates to the liquefaction and separation of ternary gaseous mixtures for the purpose of recovering the constituents thereof. The method is particularly adapted for the separation of the principal constituents of air, although it may be applied to other ternary mixtures, the...

76 citations

Patent
03 Nov 1948

49 citations

Patent
11 Nov 1933
TL;DR: In this article, it was shown that it is desirable to avoid the inclusion of oxides and nitrides in the weld metal, since their inclusion causes hardness and brittleness and further degradation.
Abstract: My invention relates, generally, to electric welding and it has particular relation to electric arc welding. In performing arc welding operations, it is desirable to avoid the inclusion of oxides and nitrides in the weld metal, since their inclusion causes hardness and brittleness and further...

47 citations

Patent
22 Jun 1948

45 citations