FLUX FOR HIGH-TEMPERATURE WELDING OF HARD ALLOYS BY COPPER-BASED SOLDERS Russian patent published in 2009 - IPC B23K35/363 

FIELD: chemistry; welding.

SUBSTANCE: invention can be applied in obtaining composition solder in the form of finished rod for high-temperature welding by copper-based alloys for application of abrasive coating onto hard alloy surface, particularly in manufacturing of cutting tools used in oil, mining and tillage engineering. Flux includes boric acid as basis and two or three more components out of group of ammonium fluoride, carbamide, borax, at the following component ratio, wt %: two or three components out of group of NH₄F (ammonium fluoride) - up to 4, CO(NH₂)₂ (carbamide) - up to 4, Na₂B₄O₇10H₂O (borax) - up to 9.6; the rest is H₃BO₃ (boric acid).

EFFECT: optimised ratio and interchangeability of flux components in manufacturing for obtainment of high quality rods, extended range of temperature and duration range of flux, enhanced wear resistance of coating.

1 dwg, 2 tbl