Hotspot Thermocouple Welder Manual

This model is suitable for welding wires up to 1.1 mm (0.043') in diameter and has an argon gas shield facility. A satisfactory thermocouple junction is produced without using argon, but where argon is available a momentary purge is automatically triggered immediately prior. The HotSpot Capacitive Discharge Welder is designed to help solve your thermocouple fabrication and attachment problems. The welder generates an electric arc for fusing standard couple elements into freestanding beads and welding them to any thickness base metal.

Thermocouple Welding and Soldering

Thermocouple Welding and Soldering

I am looking for an information source about welding and soldering Type T thermocouple (T/C) extension leads to another extension lead and also to the thermocouple wire.
Specifically information regarding the technique, sources of error, and the pro/cons of welding vs soldering.
Why is there a special procedure/technique for welding Type T and what is the special process?
Does anyone have experience with either technique?
BACKGROUND
We have 68 Type T T/C channels located outside in New England. We currently have Omega MTC-12 connectors mounted on masts with the male connector on an umbilical to the T/Cs. The female bulkhead connector is mounted on a 4x4 enclosure. The female bulkhead mount (admittedly) does not have the specified environmental backshell. As expected we are experiencing erroneous readings and open T/Cs. The connections should not have to be undone for 20-30 years. I would like to propose removing the connectors and welding or soldering the T/C cable wires at the connection at the 4x4. Also, I would like to weld or solder the extension cables to the industrial T/C leads at the T/C peckerhead.
PS: Does anyone have a better name for the 'peckerhead'?

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