ZINC SOLDER FOR ALUMINIUM SOLDING Russian patent published in 2017 - IPC B23K35/28 B23K35/40 C22C18/04 

FIELD: metallurgy.

SUBSTANCE: solder contains components in the following ratio, wt %: aluminium 2-7, copper 1-3, silicon 0.01-0.03, tin 0.01-0.2, zirconium 0.01-0.08, the rest is zinc. To produce said solder, zinc and aluminium are melted with addition of copper-aluminium master alloy and silicon-aluminium master alloy at a flow rate up to the required copper, silicon and aluminium contents. Then, 0.01-0.2% tin is mixed in the melt and cooled to 600-650°C. The molten solder is mixed with the flux from the fused mixture of salts in the form of potassium chloride 60-62% and potassium fluoride 38-40% at a rate of 0.1-0.5% by solder weight with addition to the mixture of potassium fluorozirconate at a flow rate of 0.04-0.3% of the solder weight.

EFFECT: introduction of zirconium provides soldering with high spreadability in aluminium, the zinc alloy has the ability to deform by rolling or pressing compression to obtain a solder that is convenient for soldering with a gas burner.

2 cl, 3 dwg, 1 tbl, 3 ex