Brass welding technology
Technical characteristics
Brass is an alloy that contains from 55 to 75% copper and zinc. Specialty brass grades contain small amounts of aluminum, manganese, tin, silicon and other elements. The main difficulty in welding brass is zinc burn-out, because zinc starts to boil at 905 °C and evaporates intensively. When oxidized in the air, zinc fumes precipitate as a white deposit in the welding area.
The electrodes
Brass welding is carried out by the same methods that are used for welding copper - usually using cast or pressed brass bars of LC-grade, which contain, in addition to zinc and copper, silicon. Brass filler rods contain the same amount of copper as the base metal. Silicon content should not exceed 3%. Welding is recommended in semi-vertical or horizontal position with direct current of reverse polarity for electrode Ø 6 mm, with 200÷225 A current.
Welding optimization
In order to obtain a weld metal close to the base metal composition, the electrode rods are used with the same composition as the base metal. Two layers of coating are applied to such rods. The following composition is used as the first coating layer with thickness from 0.2 to 0.3 mm: manganese ore - 30%, ferromanganese - 15%, titanium concentrate - 30%, potassium sulfate - 5%, chalk - 20%. The presence of silicon in the filler rods reduces zinc burnout, and the use of flux protects the molten metal from oxidation.
Fluxes
When welding brass it is necessary to use fluxes in the form of a mixture of the following composition: sodium chloride - 12.5%, potassium chloride - 50%, charcoal - 2.5%, cryolite - 35%. Also boron slag can be used as a flux.
Defects
Defects formed on parts made of brass LMZS-58-2-2 are welded after careful preparation. In order to reduce allocation of zinc oxide defects welding for brass castings of LMts-58-2 and LMtsS-58-2-2 grades, which contain 58% of copper, 2% of lead, and 2% of manganese is performed using OB-5 electrodes.
The supplier
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Auremo supplier's warehouse offers the widest selection of non-ferrous alloys. Always in stock brass rolled products, the price - due to the technological features of production without the inclusion of additional costs. This is the best price from the supplier. Buy today. We are waiting for your orders. We have the best price-quality ratio for the whole range of products. On communication experienced managers - will promptly help you to buy brass rolling in bulk or in installments. Regular customers can buy brass rolling with a discount discount, the price - the best in this segment of rolled products. Supplier "Auremo" is a recognized expert in the market of non-ferrous metals. Thanks to the representative offices in Eastern Europe, we have the possibility of prompt interaction with trade partners.
