SOLDERING METHOD OF PRODUCTS FROM STEEL, COPPER AND COPPER ALLOYS USING SILVER-CONTAINING SOLDER ALLOYS Russian patent published in 2014 - IPC B23K1/08 B23K1/19 B23K103/18 

FIELD: metallurgy.

SUBSTANCE: method can be used for soldering of products of any complexity, including thin-walled ones, from steel and/or materials based on copper or copper alloys. A coating from galvanic nickel with thickness of 21-30 mcm is applied to the soldered surface. Products are assembled using a silver-containing solder alloy 0.05-2.5 mcm thick. Assembled products are pre-heated to the temperature of 550-800°C in vacuum of 1·10^-2-2·10^-3 mm Hg with exposure during 30-40 minutes. Further heating is performed to soldering temperature equal to 650-950°C with exposure during 6-10 minutes. Then, temperature is quickly reduced to 600°C and soldered products together with the furnace are cooled.

EFFECT: method allows reducing oxidation of surface of the soldered material, excluding changes in its structure and minimising deformation.

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