FIELD: manufacture of constructional members of aluminum and its alloys. SUBSTANCE: method comprises steps of using flux containing fluorozincate of alkali metal or mixture of fluoride of alkali metal and zinc fluoride; performing soldering in temperature range 420 -590 C; using potassium, cesium or rubidium as alkali metal; possibly using in addition fluxes on base of potassium fluoroaluminate. Flux may contain in addition metal of solder. Flux on base of fluorozincate of alkali metal acts not only as flux itself but also it enhances soldered surface due to depositing onto it zinc and fluoroaluminates777 of alkali metal. EFFECT: enhanced quality of soldering. 19 cl, 7 dwg, 1 tbl
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