I need to weld a K type thermocouple inside a hole during welding a stainless steel. I wonder how I can join the wires inside the hole. Thank you for your answers in advance.
I have never done this myself but I would suggest spot welding. One electrode to the stainless steel block to be welded and one on the thermocouple wire. Do each thermocouple wire one at a time, or both at once, but they will need insulation which I expect will be difficult down a hole. Play with the welding parameters to get a good weld. It does not matter if the two wires do not touch as the EMF from the stainless steel in bewteen cancels out. Alternatively just use a sheathed thermocouple of the correct diameter and pass this down the hole to the bottom. A few punches with a pointed puncher around the hole will hold the sheathed thermocouple in place.
You can use HotSpot Thermocouple Welder to weld thermocouple anywhere. I used this kind of hotspot thermocouple welder just couple of weeks ago. And i use it frequently. Find details in here:
https://www.youtube.com/watch?v=C4YK44tLGok
you can use a sheathed T/C (e.g.Thermocoax) and braze it into the hole with a suitable high temp (BNi ?) alloy. Anyway, a K type T/C would not be placed in spot with temperature much above 1000 C, so that the braze will withstand the thermal load. I think this is the most reproducible solution
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