Physical and mechanical properties. Area of application of copper solder.

Area of application of copper solder.
Density, specific heat of copper solder

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Technical features

Soldering with copper solder is often used to join stronger metals, in particular, various steels (including stainless steel), nickel and its alloys , etc. In this case, the strength of the brazed seam is often greater than the strength of the copper itself, since this metal is well dissolved with the alloys to be brazed.

Vacuum brazing with copper

Properties Value
Soldering temperature, °C 1100...1120
Wetting angle**, deg:
by forge 10
for steel 9
molybdenum 35
on nickel 30
Tensile rupture strength of butt-soldered joint σb, MPa:
steel-covar 390
steel - steel 370
molybdenum - stainless steel 350
molybdenum-covar 320
molybdenum-molybdenum 410
Relative elongation δ5, %:
steel alloys -covar 30
steel - steel 33
molybdenum-covar 2,5
*The elasticity of copper vapor 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.

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Peculiarities of brazed copper joints

The ability of copper to penetrate the solder joint, mainly along the grain boundaries. Liquid copper forms intermetallic compounds when brazing steels containing a high percentage of nickel, as well as nickel itself and its alloys. At the same time should avoid prolonged brazing copper titanium molybdenum alloys: increasing the temperature and duration of exposure at such temperatures leads to the formation of fusible and brittle components, which reduce the quality of soldering. Brazing with copper brazing alloys can be combined with some heat treatment processes, particularly with annealing, which is used when brazing steels with high corrosion resistance. For a number of tool steels brazing combined with hardening, after which the connection can be tempered.

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