Physical and mechanical properties. Application field of copper solder.
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Technological properties of copper used as solder
Brazing with copper solders is often used to join stronger metals, in particular, various steels (including stainless steels), nickel and its alloys, etc. In this case, the strength of the soldered joint usually exceeds the strength of copper itself, since this metal dissolves well with the alloys that are to be soldered.
When soldering under vacuum, the technological characteristics of pure copper solder are:
|Soldering temperature, ° С||1100… 1120|
|Angle of wetting **, deg:|
|On the kovar||10|
|Temporary resistance to rupture of soldered butt joints σ b, MPa:|
|Steel — steel||370|
|Relative elongation δ 5 ,%:|
|Steel — steel||33|
|* The vapor pressure of copper at 700 ° C is less than 10 -8 mm Hg.|
|** The wetting angle is the angle formed by the tangent to the surface of the solder drop and the plane of the solid.|
Buy copper solders, designed for soldering various metals and alloys, at economically beneficial prices from the manufacturers, offers the company Electrovek-steel. The supplier ensures the timely delivery of products to the address set by the client.
Positive features of soldered joints formed with the help of copper solders
These features are caused by the properties of liquid copper to actively interact with metals that are subjected to soldering. Among them:
The ability of copper to penetrate into the soldered joint, mainly along the grain boundaries (for iron, low-carbon and structural steels);
The formation of intermetallic compounds during the soldering of steels containing a high percentage of nickel, as well as the nickel itself and its alloys.
However, prolonged copper brazing of molybdenum titanium alloys should be avoided: increasing the temperature and holding time at such temperatures leads to the formation of low-melting and brittle components that reduce the quality of soldering. Soldering with copper solders can be combined with some heat treatment processes, in particular, with annealing, which is used for soldering steels with increased corrosion resistance. For a number of tool steels, soldering is combined with quenching, after which the joint can be tempered.
Buy copper brazing alloys in any number and range offers the company Elektrovek-steel. Available prices are from manufacturers. The supplier guarantees the timely delivery of products to the address specified by the consumer.