2,315
edits
Changes
→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.
*Typical configurations of toplay contact profiles (<figure xr id="fig:Toplay brazing with an inductive heating inline equipment (schematic)Typical configurations of toplay contact profiles2"/>[[File:Toplay brazing with an inductive heating inline equipment (schematic).jpg|right|thumb|Figure 5: Toplay brazing with an inductive heating inline equipment (schematic)]]</figure>
*Contact materials <br />Ag, AgNi 0,15 (ARGODUR), AgCu, AgCuNi (ARGODUR 27), Ag/Ni (SINIDUR), Ag/SnO<sub>2</sub> and Ag/ZnO<br />
*Quality criteria, dimensions and tolerances (<xr id="fig:Quality criteria dimensions and tolerances"/>)
Strength properties and dimensional tolerances of toplay profiles are derived from the standards DIN EN 1652 and DIN EN 1654 for Cu alloys.
<div class="multiple-images">
<figure id="fig:Toplay brazing with an inductive heating inline equipment (schematic)">
[[File:Toplay brazing with an inductive heating inline equipment (schematic).jpg|right|thumb|Figure 5: Toplay brazing with an inductive heating inline equipment (schematic)]]
</figure>
<figure id="fig:Typical configurations of toplay contact profiles2">
[[File:Typical configurations of toplay contact profiles2.jpg|right|thumb|Figure 6: Typical configurations of toplay contact profiles]]
</figure>
<figure id="fig:Quality criteria dimensions and tolerances">
[[File:Quality criteria dimensions and tolerances.jpg|right|thumb|Figure 7: Quality criteria dimensions and tolerances]]
</figure>
=== Contact Profiles (Contact Weld Tapes)===
