[Username1]

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Your not looking for a welder. You need to understand the energy requirement to make
a weld in the filament wire. Know also that you are welding that in a non-oxygen
environment. You need to look at joul energy in a charge held by a cap of
specific size, and with a specific voltage charge, Is this joul energy
of sufficient size to make a tungsten & whatever it may have
been mixed with of a specific diameter to make a good weld.
I don't know where to look, not welding books.

You might want to experiment - get some filament wire and
figure out what size cap & charge makes a good weld.

I know there are methods to weld filament wire inside a
tube, I remember reading about it years ago in tv repair
magazines....

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