Relevance

Brass is an alloy that contains between 55% and 75% zinc and copper. 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 it starts to boil and at temperatures above 905 °C and evaporates intensively. When oxidized in the air, zinc fumes precipitate as a white deposit on the surrounding objects.

Electrodes

Brass is welded in the same manner as copper - usually by casting or extruding brass bars of the LC grade that contain, in addition to zinc and copper, silicon. Brass filler rods contain the same amount of copper as the base metal. The amount of silicon in them 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 current 200÷225 A.

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 on 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 structure: 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 welding defects in brass castings LMts-58-2-2 and LMtsS-58-2-2, which contain 58% copper, 2% lead, 2% manganese are electrodes grade OB-5.

Buy, price

The company Evek GmbH sells brass products at the best price. It is formed taking into account the rates at the LME (London metal exchange) and depends on the technological features of production without additional costs. All batches of products have the certificate of quality for compliance with the standards. With us you can buy in bulk the most various products for large-scale productions. The wide choice, exhaustive consulting of our managers, reasonable prices and timeliness of delivery determine the face of our company. There is a system of discounts for wholesale purchases.