Patent
Electric arc welding
TLDR
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.read more
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Patent
Protective gas welding process
TL;DR: In this article, Messer et al. presented a gas-shielded consumable wire-electrode welding, where the shielding gas is a mixture of argon and more than 10% and not more than 25% by volume, oxygen, and the wire electrodes used contain at least 1A0% Mn, by weight, and at least 0A4% Si, by value, as deoxidizing components.
Patent
Hafnium electrode with inclusion used in an active medium
TL;DR: In this paper, an object of the present invention is to provide a cathode for electric arc processes in active media which is based on hafnium and comprises additions selected from a group comprising rare earths, alkali metals and alkaline earth metals and their oxides as well as transition elements of the IV, V, VI and VIII groups of the D. I. Mendeleev Table taken separately or in a combination.
References
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Patent
Separation of the constituents of gaseous mixtures
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.
Patent
Arc welding apparatus
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.