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Brazing of brass and brass alloys

Brazing of brass and brass alloys

Are you interested in brazing? Supplier Avlob offers to buy brass rolls at a bargain price. The supplier guarantees the timely delivery of products to any address in Europe or abroad. Regular customers receive a discount discount. The price is the best in this segment.

Soldering difficulties

Zinc also forms a surface oxide film. In brasses that contain up to 15% Zn, the oxide film consists of adherent particles of ZnO and CuO. In alloys containing a large amount of zinc, the oxide layer consists mainly of ZnO, which is more difficult to remove than copper oxide. Supplier Avlob offers to buy brass at a bargain price. The price is the best in this segment of rental.

Technical characteristics of soldering

Low-temperature brazing of lead-tin, etc., with solders requires removal of the oxide film from the brass surface. Use rosin-alcohol or more active fluxes. For example, in the process of soldering brass grades L63, LS59−1-1 fluxes based on ZnCl 2 are used. Seams obtained with soldering L63 lead-tin solders have reduced strength. The tensile strength of tin-brazed copper joints is 90 MPa, and brass — no more than 59 MPa. When soldering brass, with a high content of copper, silver solders of grades are used: PSr40, PSr72, PSr45, PSr12, PSr25. When brazing such brass as (Л68, Л63) solder PSр40 is used. For them, phosphorous brazing alloys are not suitable, since soldered low-plastic joints appear. This can be explained by the fact that very brittle zinc phosphides are formed in the seam. For those compounds that are not subject to dynamic and vibrational loads, PMC48 and PMC36 solders are used.

Temperature conditions

Brass parts can be soldered at temperatures of 850−870 ° C and in salt baths. To improve the flow of solder into the bath solution, a 4−5% flux is added to the gap, which contains borax or potassium fluoroborate. In the process of heating parts in furnaces and in the flame of gas burners, oxidation and evaporation of zinc also occur, thereby worsening the spreading of solders. During the soldering of brass with the help of a burner, it is possible to slightly reduce the oxidation and evaporation of zinc in a reducing flame.

Fluxes

The use of flux allows the molten metal to be protected from oxidation. Fluxes are used in the form of a mixture of the following composition: sodium chloride — 12.5%, potassium chloride — 50%, charcoal — 2.5%, cryolite — 35%. Boric slag can also be used as a flux.

Delivery, price

Are you interested in brazing? Buy brass rolls at an affordable price from the supplier Avgob today. The price is formed on the basis of European production standards. Supplier Avlob offers to buy brass rolls at the optimal price in bulk or at retail.