Strength properties and dimensional tolerances of toplay profiles are derived from the standards DIN EN 1652 and DIN EN 1654 for Cu alloys.
=== Seam–Welded Contact Strip Materials (FDR–Profiles)===
Seam–welding is the process by which the contact material in the form of a solid wire, narrow clad strip, or profile is attached to the carrier strip by overlapping or continuous weld pulses between rolling electrodes <xr id="fig:Seam-welding process (schematic)"/><!--(Fig. 3.6)-->. The weld joint is created by simultaneous effects of heat and pressure. Except for the very small actual weld joint area the original hardness of the carrier strip is maintained because of the limited short time of the heat supply. Therefore also spring-hard base materials can be used without loss of their mechanical strength. The use of clad contact pre-materials and profiles allows to minimize the use of the costly precious metal component tailored to the need for optimum reliability over the expected electrical life of the contact components.
*Typical configurations of seam–welded contact strips and stamped parts <xr id="fig:Typical configurations of seam-welded contact strips"/>
<figure id="fig:Typical configurations of seam-welded contact strips">
[[File:Typical configurations of seam-welded contact strips.jpg|right|thumb|Typical configurations of seam-welded contact strips]]
</figure>
<figure id="fig:Seam-welding process (schematic)">
[[File:Seam-welding process (schematic).jpg|right|thumb|Seam-welding process (schematic)]]
</figure>
*Contact materials <br />Au-Alloys, Pd-Alloys, Ag, AgNi 0,15 (ARGODUR), AgCu, AgCuNi (ARGODUR 27), Ag/Ni (SINIDUR), Ag/CdO (DODURIT CdO), Ag/SnO<sub>2</sub> (SISTADOX), Ag/ZnO (DODURIT ZnO)<br />
*Carrier materials <br />Cu, CuSn, CuZn, CuNiZn, CuBe et al.<br />
*Dimensions <xr id="fig:Contact Profiles Dimensions"/>
<figure id="fig:Contact Profiles Dimensions">
[[File:Contact Profiles Dimensions.jpg|right|thumb|Contact Profiles Dimensions]]
</figure>
*Quality criteria 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..
=== Contact Profiles (Contact Weld Tapes)===
