BRAZING MATERIALS

• US 3,853,547 A
• Filed: 05/25/1973
• Issued: 12/10/1974
• Est. Priority Date: 05/25/1973
• Status: Expired due to Term

• Current Assignee: Ogle R. Singleton Jr
• Original Assignee: Ogle R. Singleton Jr
• Inventors: Singleton, Ogle R. Jr.
• Primary Examiner(s): Bizot, Hyland
• Application Number:
  US05/363,910
• Time in Patent Office: 564 Days
• Field of Search: 75/141,146,147,148,142
• US Class Current: 420/534
• CPC Class Codes: B23K 35/002 at least one of the workpieces being of light metal
• CPC Class Codes: B23K 35/286 Al as the principal constituent
• CPC Class Codes: B32B 15/016 all layers being formed of aluminium or aluminium alloys
• CPC Class Codes: C22C 21/02 with silicon as the next major constituent
• CPC Class Codes: C22C 21/04 Modified aluminium-silicon alloys

Abstract

An aluminum-silicon brazing composition containing about 0.02 to 0.20% bismuth by weight, with silicon in the range from about 7 to 14% and magnesium in the range from about 0.2 to 2%; preferably employed as a cladding layer on a magnesium-containing aluminum base core alloy.

Claims

1. AN IMPROVED BRAZING COMPOSITION EFFECTIVE FOR JOINING ALUMINUM ALLOY COMPONENTS BY VACUUM BRAZING CONSISTING ESSENTIALLY OF ALUMINUM, ABOUT 7 TO 14% SILICON, ABOUT 0.2 TO 2% MAGNESIUM AND ABOUT .02 TO 0.20% BISMUTH, BY WEIGHT, WITH MINOR ELEMENTS AND IMPURITIES IN AMOUNTS UP TO ABOUT 1% IRON, 0.2% COPPER, 0.25% MANGANESE, 0.6% EACH IN THE CASE OF ZINC AND TITANIUM, OTHERS NOT EXCEEDING 0.05% EACH AND 0.15% TOTAL.

2. The brazing composition of claim 1 containing about 0.1% bismuth.

3. The brazing composition of claim 2 containing about 0.3 to 1.5% magnesium. 4. The brazing composition of claim 1 containing up to about 0.3% iron.

5. The brazing composition of claim 1 containing up to about 0.2% zinc.

6. The brazing composition of claim 1 containing up to about .05% titanium.

7. The brazing composition of claim 1 containing about 9 to 11% silicon, about 0.3 to 1.5% magnesium and about 0.1% bismuth.