§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US3675310A Expired / Lapsed US ⏱️ 0.0 years remaining

Soldering method

Assignee: United States Department of the Interior
•
Filing: 1971-04-20
•
Granted: 1972-07-11
•
Expires: 1991-04-20
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Metallic members consisting essentially of copper or copper alloy, low carbon steel, stainless steel, nickel or nickel alloy, or any combination thereof, are joined together by initially coating the members to be joined with a thin layer of nickel, followed by application of solder consisting essentially of zinc or zinc alloy and appropriate fluxes containing metallic salts, at a temperature of about 320* to 500* C. The metallic members may also be joined by addition of nickel or nickel salts to the flux material so that the required thin nickel coating is obtained by a reaction during soldering such that the coating is deposited on the surface of the metallic members from the flux. The thin layer of nickel, obtained as above, constitutes a ''''sacrificial metal coating'''' that is absorbed into the molten solder during soldering. The method of the invention is particularly useful in manufacture and repair of automobile radiators and utensils or appliances for home cooking.

Inventors

  • 👤 Alfred E Schwaneke
  • 👤 Wilbert L Falke
  • 👤 Orrin K Crosser

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 03:02
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/001; B23K35/22; B23K35/24; B23K35/28; B23K35/282; B23K35/36; B23K35/3601; B23K35/3603

Claims Analysis

Total Claims: 14
Claim 1
Independent Claim 16 words
The method of claim 1 in which the copper alloy to be soldered is a brass.
Claim 2
Dependent Claim 28 words
The method of claim 2 in which the zinc is removed from a thin surface section of the brass member by etching before the nickel layer is applied.
Claim 3
Dependent Claim 14 words
The method in claim 1 in which the nickel layer is applied by electroplating.
Claim 4
Dependent Claim 18 words
A method of claim 1 in which the nickel layer is applied by sputtering in a vacuum enclosure.
Claim 5
Dependent Claim 11 words
The method of claim 1 in which the solder is zinc.
Claim 6
Dependent Claim 20 words
The method of claim 1 in which the solder is a zinc-aluminum alloy containing about 4 to 30 percent aluminum.
Claim 7
Dependent Claim 14 words
The method of claim 7 in which the alloy contains about 20 percent aluminum.
Claim 8
Dependent Claim 26 words
The method of claim 1 in which the solder is a zinc-aluminum-copper alloy containing about 7 to 20 percent aluminum and 1 to 5 percent copper.
Claim 9
Dependent Claim 16 words
The method of claim 1 in which a flux is also employed in the soldering process.
Claim 10
Dependent Claim 19 words
The method of claim 10 in which the flux consists of a mixture of metal chlorides and metal fluorides.
Claim 11
Dependent Claim 21 words
The method of claim 10 in which the layer of nickel is obtained from a flux containing nickel or nickel salts.
Claim 12
Dependent Claim 18 words
The method of claim 12 in which the flux contains about 1 to 4 percent powdered nickel metal.
Claim 13
Dependent Claim 17 words
The method of claim 12 in which the flux contains about 0.6 to 1.5 percent nickel chloride.
Claim 14
Dependent Claim 22 words
The method of claim 1 in which the soldering operation is performed in an inert or reducing atmosphere without employing a flux.

References Cited (Backward Citations)

GB309032A Cited
US2001186A Cited
GB547755A Cited
US3364064A Cited
US3412455A Cited
US3299503A Cited
US3355265A Cited
US3469301A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-07-11 1976-01-10 1976-07-11 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-07-11 1980-01-10 1980-07-11 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-07-11 1984-01-10 1984-07-11 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag