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→Vertical Wire Welding
===== Vertical Wire Welding=====
During vertical wire welding the contact material is vertically fed in wire form through a clamp which at the same time acts as one of the weld electrodes ''<xr id="fig:Vertical wire welding (schematic)"/> (Fig. 3.9)''. <figure id="fig:Vertical wire welding (schematic)">
[[File:Vertical wire welding (schematic).jpg|right|thumb|Vertical wire welding (schematic)]]
</figure>
With one or more weld pulses the roof shaped wire end – from the previous cut-off operation – is welded to the base material strip while exerting pressure by the clamp-electrode. Under optimum weld conditions the welded area can reach up to 120% of the original cross-sectional area of the contact wire. After welding the wire is cut off by wedge shaped knives forming again a roof shaped weld projection. The welded wire segment is subsequently formed into the desired contact shape by stamping or orbital forming. This welding process can easily be integrated into automated production lines. The contact material must however be directly weldable, meaning that it cannot contain graphite or metal oxides.
===== Horizontal Wire or Profile Welding=====