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→Brazed Semi-Finished Contact Materials (Toplay–Profiles)
=== 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 <xr id="fig:Toplay brazing with an inductive heating inline equipment (schematic)"/> <!--(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.
<figure id="fig:Toplay brazing with an inductive heating inline equipment (schematic)">
</figure>
*Typical configurations of toplay contact profiles (<xr id="fig:Typical configurations of toplay contact profiles2"/>)
<figure id="fig:Typical configurations of toplay contact profiles2">
*Carrier materials <br />Cu, CuZn, CuSn et al.<br />
*Quality criteria, dimensions and tolerances (<xr id="fig:Quality criteria dimensions and tolerances"/>)
<figure id="fig:Quality criteria dimensions and tolerances">
