Soldering brass
Peculiarities of soldering
Brazing temperature depends on the amount of zinc in the alloy, and does not depend on the thickness of the processed product. Remember that high-temperature brazing of rolled brass can complicate the burnout of zinc with the formation of cracks and pores. The melting temperature depends on the amount of zinc in the alloy, and does not depend on the thickness of the processed item.
Fluxes
Before low-temperature soldering with lead-tin solders, remove the oxide film from the surface with rosin-alcohol or more active fluxes, such as zinc chloride-based fluxes. Brass is not readily soluble in lead-tin solders. The compounds obtained by soldering L63 with lead-tin solders have a lower tensile strength compared to copper - under the same conditions. For example, the ultimate strength of tin-bonded joints of copper is 90 MPa, that of brass is not more than 59 MPa.
Solders
When brazing brasses with high copper content silver brazing alloy s are used: PSr40, PSr72, PSr45, PSr12, PSr25. When brazing brass, L68, L63 use solder PSr40. Phosphorous solders are not suitable for them as they produce low ductility solder joints. This can be explained by the fact that brittle zinc phosphides are formed in the solder seam.
For those joints that are not subjected to dynamic and vibration loads, PMC48 and PMC36 solders are used. During soldering with copper-phosphorous and silver solders, the brass starts to dissolve intensively. Therefore to reduce the contact of solid metal and liquid solder they should be soldered at high heating rates. Brass of L63 grade dissolves intensively in solders PSr45, PSr40 and PSr15 and much less in solders PSr50KD and PSr37.5.
Temperature conditions
Parts made of brass can be brazed at temperatures of 850-870°C and in salt baths. To improve the flow of solder in the bath solution in the gap adds 4-5% flux, which contains borax or potassium fluoroborate. In the process of heating the parts in ovens and in the flame of gas burners is also oxidation and evaporation of zinc, thereby worsening the flow of solder. When brazing brass with a burner, the oxidation and evaporation of zinc in the reducing flame can be slightly reduced. The porosity in the solder joints is thus reduced.
Furnizor
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