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Introduction To The Oxides Of Copper Pin
- Oct 30, 2017 -

The brazing properties of carbon steel and low-alloy steels depend largely on the type of oxides formed on the surface of the material. As the temperature increases, four types of oxides of Y-fe2o3, A-fe2o3, $literal and Feo are formed on the surface of the carbon steel. These oxides, in addition to $literal, are porous and unstable, they are easily removed by the solder, but also easily reduced by reducing gases, so carbon steel has a good brazing property.Copper Pin

For Low-alloy steels, if the alloying elements are fairly low, the oxides present on the surface of the material are basically iron oxides, and the Low-alloy steels have the same brazing properties as carbon steel. If the alloying elements are increased, especially the increasing of the elements such as A1 and CR to form stable oxides, the brazing property of low alloy steel will be worse, then the active brazing agent or dew-point protection gas should be used for brazing. Pure copper, copper and zinc and silver-copper-zinc brazing filler are mainly used in hard brazing of carbon steel and low-alloy steel. Pure copper melting point is high, brazing is easy to make the mother material oxidation, mainly used for gas shielded brazing and vacuum brazing.Copper Pin However, it should be noted that the clearance of brazed joints should be less than 0. 05mm, so as not to produce because of the good activity of copper and the joint clearance can not fill the topic. The carbon steel and low alloy steel joints with pure copper brazing have high strength, the general shear strength is within the 150~215mpa range, and the tensile strength is distributed between 170~340mpa.Copper Pin

Compared with pure copper, the melting point of copper-zinc brazing material decreases with the addition of Zn. In order to prevent the evaporation of Zn during brazing, a small amount of SI can be added into the copper-zinc filler, on the other hand, the method of rapid heating, such as flame brazing, induction brazing and dip brazing, etc., must be used. Both carbon steel and low alloy steel joints with brazing of copper and zinc have good strength and plasticity.Copper Pin 

For example, the tensile strength of carbon steel joints brazed by B-CU62ZN filler is up to 420MPa, and the shearing intensity is up to 290MPa. The melting point of Ag-Cu-Zn brazing filler is lower than that of copper-zinc brazing filler, so it is easy to manipulate brazing. This filler is suitable for flame brazing, induction brazing and furnace brazing in carbon steel and low alloy steel, but the content of Zn should be reduced as far as possible during brazing in the furnace, and the heating speed should be improved.Copper Pin