CS261660B1 - Flux for welding with a high-alloyed band electricity - Google Patents

Abstract

The solution concerns the composition of the flux for welding anti-corrosion layers on unalloyed, low-alloyed and austenitic steels with a high-alloy strip electrode. The essence lies in the chemical composition of the flux, which consists of silicon dioxide from 4 to 12 wt. %, aluminum oxide from 24 to 33 wt. %, manganese oxide from 7.1 to 10 wt. %, calcium oxide from 0.1 to 6 wt. %, barium oxide from 8.1 to 12 wt. %, calcium fluoride from 35 to 45 wt. %, sodium and potassium oxide, magnesium oxide

Description

261658

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flux-welded, electrolytic strip electrode for non-alloyed low-alloy and austenitic steels. In the process of surfacing by electrode strip flux, the flux has a decisive influence on the mold formation, the slag removability and the chemical composition of the weld. Good mold formation and spontaneous slag removability are necessary to achieve a defective weld. The tendency of zapekaniatroska increases mainly when welding with niobium-containing tape electrodes.

Unfavorable metallurgical effect of the flux! on the chemical composition of the deposit, and on the alloying of the silicon and the chromium overcoat. Increasing the silicon content of hot cracks in the weld. Reducing the chromium and niobium content impairs the resistance to intercrystalline corrosion.

A flux of the following composition is known: 6 to 15 wt. of silica, 1 to 7. wt. manganese oxide, 36.7 to 47 ppm. wt. % alumina, 1 to 4% by weight of magnesium oxide, 10 to 17% by weight of magnesium oxide, % of calcium oxide, 1 to 3 wt. % sodium and potassium oxides together, 16 to 26 wt. calcium fluoride, 1 to 8 wt. fluoridubarate. Said flux does not have good opaque properties. The caterpillar is bumpy and mugged in the middle. The slag is sealed on the surface of the caterpillar.

A melted flux of the following chemical composition is known: 28 to 38 wt. % silicon dioxide, 15 to 29 wt. % of aluminum oxide, 5 to 13 wt. % calcium oxide, 10 to 18 wt. calcium fluoride, 17 to 30% magnesium oxide, 0.2 to 2.5 wt. sodium and potassium oxides together, 0.8 to 8 wt. % barium oxide, 1 to 6 wt. manganese oxide. This flux is a bead-forming blast due to the high content of silica. The high content of silicon dioxide causes the silicon to be reduced from the flux to the weld, causing susceptibility to heat cracking.

These drawbacks are largely removed by the flux for welding with a high-alloyed strip electrode of anticorrosive layers on unalloyed, low-alloyed and ausititic steels containing sodium and potassium oxides, magnesium oxide, the substance of which further consists of oxi. from 4 to 12% by weight silicon dioxide, from 24 to 33% by weight aluminum oxide, from 7.1 to 10% by weight manganese oxide, from 0.1 to 6% by weight of calcium oxide; of barium oxide from 8.1 to 12 wt. and calcium fluoride from 35 to 45 wt.

In the welding of the strip electrode with the melting stage of the invention, the combustion of the arc is stable. The caterpillar is evenly formed by a smooth surface. Removal of slag also spontaneously when handling niobium-containing strip electrodes. Consumption is low, about 0.7 kg of flux per kg of boiled metal. Good slag formation and good removability has been achieved by an optimal combination of silica, alumina and magnesium oxide.

The flux according to the invention has a very favorable metallurgical effect on the chemical composition, characterized by a low alloying of silicon, a small amount of chromium and niobium, resulting from an optimum combination of calcium fluoride, silica and manganese. The fluxes of the invention consisting of 6% by weight were tested by tests. % silicon dioxide, 28.9 wt. of alumina, 7.1% by weight; % manganese oxide, 3 wt. % calcium oxide, 2 wt. % of magnesium oxide, 10 wt. % barium oxide, 2.5 wt. sodium and potassium oxides, 40.4 wt%, calcium fluoride, excess flux impurities, iron oxide, phosphorus sulfur. A weld made using this melter with a high-alloy strip electrode of 20.35% by weight. % chromium, 2.75% w / w, 0.13% w / w; the silicon had a very large molded caterpillar with a smooth surface and smooth passages of the huzenini, the slag separating itself spontaneously. Also, a favorable metallurgical effect was achieved, the chromium content of the weld was 19.25% by weight, the niobium content was 2.66% by weight. a silicon content of 0.35% by weight; With a flux of 9% by weight. % silica, 28 wt. alumina, 8.5p. wt. % manganese oxide, 3% calcium oxide, 2% wt. % magnesium oxide, 9.5 wt. % barium oxide, 1 wt. % sodium and potassium oxides together, 38.9 wt. calcium fluoride, dirt impurities, iron oxide, phosphorus, aspirate also have very good molding properties and a favorable metallurgical effect of depositing the weld.

OBJECT

The flux for welding with a high alloyed anticorrosion layer electrode of a non-alloyed, low-alloyed, and austenitic steel comprising sodium and potassium oxide, magnesium oxide, further comprising 4.0 to 12.0% by weight. % silicon dioxide, 24.0 to 33.0 wt. aluminum oxide, 7.1 to 10.0 wt. % oxidumanganate, 0.1 to 6.0 wt. % of foamy oxide, 8.1 to 12.0 wt. % of barium oxide and 35.0 to 45.0 wt. calcium fluoride.

Claims (2)

SUBJECT A flux for welding with a high-alloy strip electrode of anticorrosive layers to unalloyed, low-alloy and austenitic steels containing sodium and potassium oxide, magnesium oxide, characterized in that it further comprises 4.0 to 12.0 wt. % silicon dioxide oynAleze, 24.0 to 33.0 wt. % alumina, 7.1 to 10.0 wt. 0.1 to 6.0 wt. % calcium oxide, 8.1 to 12.0 wt. % barium oxide and 35.0 to 45.0 wt. calcium fluoride. CZECHOSLOVAK SOCIALIST REPUBLIC (1B) DESCRIPTION OF THE INVENTION CERTIFICATE 261659 (11) (Bl) (51) Int. Cl. ⁴ C 21 D 9/52 (22) Entries 17 06 87