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
Device for handling powder for a welding apparatus
TL;DR: A welding device for powder welding is described in this paper, which comprises a welding head for transportation of at least one welding electrode to a welding area, and a powder transportation device for transport of powder from a container to the welding area.
Patent
Method of avoiding or inhibiting intermixing of the atmosphere which exists in an enclosed space with a gaseous substance present in the same space
TL;DR: In this paper, a change in density of the atmosphere is induced in either lower or upper area of the space such that a stable atmosphere stratified into superimposed layers is formed in that space.
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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.