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US3582604A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of plasma treatment of metals

Assignee: Individual
•
Filing: 1969-01-17
•
Granted: 1971-06-01
•
Expires: 1989-01-17
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Abstract

Abstract A method is provided for plasma treatment of metals without removing the material from the treatment area (for example, welding, surfaceremelting, surfacing and the like) by a transfer plasma arc burning between the plasmatron electrode and the metal being treated, one of the electrode areas of the arc being located on said metal. The method consists in that the plasma treatment is carried out in a layer of flux and plasma is produced from a gas mixture comprising components having considerably different values of heat conductivity at arc temperatures. The component with the relatively high heat conductivity is hydrogen, helium or nitrogen, and the component with the relatively low heat conductively is neon, argon, xenon, krypton or nitrogen.

Inventors

  • 👤 David Grigorievich Bykhovsky
  • 👤 Alexandr Ivanovich Danilov
  • 👤 Alexandr Yakovlevich Medvedev
  • 👤 Mikhail Gershenovich Fridlyand

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 17:15
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; B; B23; B23K; B23K10/00; B23K35/00; B23K35/22; B23K35/38; B23K35/383; Y; Y10; Y10S; Y10S148/00; Y10S148/061

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 30 words
A method according to claim 1, wherein the gas mixture is argon and helium, the latter being used in a proportion from 66 to 85 percent of the mixture volume.
Claim 2
Dependent Claim 29 words
A method according to claim 1, wherein the gas mixture is hydrogen and argon, hydrogen being used in a proportion from 5 to 10 percent of the mixture volume.
Claim 3
Dependent Claim 29 words
A method according to claim 1, wherein the gas mixture is nitrogen and argon, nitrogen being used in a proportion from 33 to 75 percent of the mixture volume.
Claim 4
Dependent Claim 41 words
A method as claimed in claim 1, wherein said layer of flux is produced by applying the flux on the metal to cover the same in the region of treatment prior to the transfer of the electric arc to the metal.

References Cited (Backward Citations)

US2932721A Cited
US3149222A Cited
US3324334A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-05-31 1974-11-30 1975-06-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-05-31 1978-11-30 1979-06-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-05-31 1982-11-30 1983-06-01 $7700.00 Window Closed / Lapsed

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