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| Twist and solder k type thermocouple wires |
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| Faringdon:
Hi, Dont have access to the welder at the mo' What temperature is it ok for, if i twist together the thermocouple wires, and then solder that twist?. I cant solder them if i dont twist the wires together since they wont take the solder, as the vicious flux is at the main lab, not where i am now. |
| jpanhalt:
If you are sure you can solder K-type, go ahead. Brazing might be more effective. You cannot rely on a twist alone. With TIG or hydrogen torch, I can weld a TC in 10 seconds or less. How many to you need? Try "evaluating" a TIG welder before buying, assuming the dealer doesn't already know you. |
| Stray Electron:
I don't think that you can solder thermocouple wires together since the solder alloy will interfere with electrical response of the two materials used in the thermocouple. I saw something in a old electronics magazine once where they welded a thermocouple joint together using a homemade carbon arc welder for welding together thermocouple joints. They used two carbon center electrode out of carbon zinc batteries for the electrodes and powered the circuit from a large 12 car battery and wired together with heavy gauge welding cable. I don't remember if they used the center electrodes from a D sized battery or from one of the larger cylindrical batteries. |
| magic:
--- Quote from: Stray Electron on October 06, 2023, 02:21:51 am ---I don't think that you can solder thermocouple wires together since the solder alloy will interfere with electrical response of the two materials used in the thermocouple. --- End quote --- "The thermocouple" is the pair of wires running from the blob at the end to the plug, not the metal blob itself. When the ends of uncontaminated wires are at the same temperature as the blob, it doesn't matter what the blob is contaminated with. There are bigger practical problems: the junction melts at 180°C and it's difficult to solder these metals in the first place. I once repaired a K type thermocouple by soldering, using dilute phosphoric acid as flux. It passed the boiling water test closely enough. |
| jonpaul:
Will oxidize and give false readings. Easy to buy ready made from Omega, Fischer, Thermo-Electric, Fluke $10..30 with connectors Jon |
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