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→Percussion Welding
==== Percussion Welding====
This process of high current arc discharge welding required the contact material and carrier to have two flat surfaces with one having a protruding nib. This nib acts as the igniter point for the high current arc ''<xr id="fig:Percussion welding (schematic)"/> (Fig. 3.11)''. <figure id="fig:Percussion welding (schematic)">
[[File:Percussion welding (schematic).jpg|right|thumb|Percussion welding (schematic)]]
</figure>
The electric arc produces a molten layer of metallic material in the interface zone of the contact tip and carrier. Immediately afterwards the two components are pushed together with substantial impact and speed causing the liquid metal to form a strong joint across the whole interface area.
Because of the very short duration of the whole melt and bonding process the two components, contact tip and carrier, retain their mechanical hardness and strength almost completely except for the immediate thin joint area. The unavoidable weld splatter around the periphery of the joint must be mechanically removed in a secondary operation. The percussion welding process is mainly applied in the production of rod assemblies for high voltage switchgear.
====Laser Welding====
