Physical and mechanical properties. Scope of copper brazing.
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Technical specifications
Brazing with copper solders is often used to join stronger metals, in particular 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 alloys to be soldered. Below are the technological characteristics of compounds obtained by soldering with copper brazing under vacuum conditions:
| Properties | Value |
| Soldering temperature, ° С | 1100… 1120 |
| Angle of wetting **, deg: | |
| on the kovar | 10 |
| for steel | 9 |
| on molybdenum | 35 |
| over nickel | thirty |
| Temporary resistance to rupture of brazed joints σb, MPa: | |
| kovar with steel | 390 |
| steel with steel | 370 |
| molybdenum-corrosion-resistant steel | 350 |
| kovar molybdenum | 320 |
| molybdenum with molybdenum | 410 |
| Relative elongation δ5,%: | |
| kovar with steel | thirty |
| steel — steel | 33 |
| molybdenum-kovar | 2.5 |
| * The vapor pressure of copper is less than 10−8 mm Hg. (temperature 700 ° C) | |
| ** The wetting angle is the angle formed by the tangent to the surface of the solder drop and the plane of the solid. | |
Advantages of copper solders
The ability of copper to penetrate deep inside the soldered joint, mainly along the boundaries of iron grains… 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. 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.
Avoid
It is necessary to avoid prolonged soldering with copper molybdenum titanium alloys: as this leads to the formation of low-melting and brittle components that reduce the quality of soldering.
Delivery, price
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