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===3.2.2 Brazed Semi-Finished Contact Materials (Toplay–Profiles)===
The toplay process starts with a flat or profile – shaped contact material strip
which is fed together with the wider non-precious carrier material and in most
cases an intermediate thin foil of brazing alloy into a induction brazing machine
''(Fig. 3.5)''. An evenly distributed and reliable braze joint can be achieved this way
between contact and carrier materials. The combined material strip is rather soft
after the brazing process and re-hardened during a subsequent profile rolling
step. In this way different shapes and configurations can easily be achieved.
Fig. 3.5: Toplay brazing with an inductive heating inline equipment (schematic)
*Typical configurations of toplay contact profiles
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*Contact materials
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*Carrier materials
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*Quality criteria, dimensions and tolerances
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Strength properties and dimensional tolerances of toplay profiles are derived
from the standards DIN EN 1652 and DIN EN 1654 for Cu alloys.
===3.2.3 Seam–Welded Contact Strip Materials (FDR–Profiles)===
