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Will a high speed steel or a carbon steel die be able to put thread...
nickel rods over tungsten carbide since they both perform well in spark gap applications...
You did not say that you are going to use them for spark gap applications.
If you want lower arcing voltage, use a pointed rod (tungsten is ok but not the carbide) and expect the point to wear away with continuous use. Tungsten has a very high melting point but it is not resistant to bombardment with high energy ions...
If you want a stable discharge, use a rounded tip that may need slightly higher voltage but the life will be longer (discharge arc will start from a random point).
If you solder a nice round ball to the tip (neat soldering without rough edges is the key) that the material can be anything (copper or aluminium or gold or platinum; make your choice) but the arc will need higher voltage to start.
The link you pasted in #4 does not work.
Seems they use nickel in spark plugs because it will outlast tungsten...
you can buy all kinds of spark gaps and triggered spark gaps
with all kinds of trigger voltages and current capabilities
with the advantage of being well known and documented
what requires you build your own?