I find that a 14 to 15 Joule pulse weld gives the best results. The welder is an Orion model 100c micro pulse TIG welder.

Three welds are used for each wire to ensure solid attachment.

I formulated an ultra high temp silicate adhesive to protect the weld and prevent the fiberglass sleeving from fraying.  

The general process is just to add aluminum oxide powder to a sodium silicate solution to make a thin paste, then add just a tiny bit of trisodium phosphate (targeting around 1% of the amount of aluminum oxide).

It needs a few hours to set then should be cured at around 150 degrees C to drive out any remaining water.