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Thread: Thermocouple welder
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28th Dec 2016, 07:50 PM #1
Thermocouple welder
Wondering if anyone has a thermocouple welder or a mini spot welder etc that would do the same job
This is fory brother in law. Not sure what his budget is but said I'd put it out there for him
Dave TTC
Turning Wood Into Art
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28th Dec 2016, 08:53 PM #2
There are two people in Horsham who can do that for you: their names are Peter Hart and Jayson..... both are on this forum.
Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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28th Dec 2016, 09:08 PM #3
Thanks Joe,
My brother in law wants to buy one but if someone could help him out he is actually in Helensburgh, Sydney. Not far from Chris Parkes.
Sent you a text message the other day. Did you get it?
Dave TTC
Turning Wood Into Art
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4th Jan 2017, 10:10 AM #4Novice
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Dave
If you're looking to join K type, you can just twist the wires and then silver solder
John
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4th Jan 2017, 11:27 AM #5
Hi John
This is for my brother-in-law. Not sure exactly what he wants to do but will ask him.
Thx
Dave TTC
Turning Wood Into Art
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9th Jan 2017, 02:04 PM #6Senior Member
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9th Jan 2017, 03:11 PM #7
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10th Jan 2017, 09:30 PM #8Senior Member
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Dave,
Ask the B-I-L if he is using plain open wire TC's or sheathed.
Cheers Phil
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10th Jan 2017, 10:21 PM #9
Will do
Dave TTC
Turning Wood Into Art
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10th Jan 2017, 11:58 PM #10
This is the two pics he sent
Hope that helps
Dave TTC
Turning Wood Into Art
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11th Jan 2017, 07:09 PM #11
Those look fusion welded.
I would think that the ideal tool is a micro torch running a fuel gas (acetylene would best) and oxygen.
Banggood.com currently offer such a torch and I bought one. It's a ripper.
Sent from my InFocus M808 using TapatalkCheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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11th Jan 2017, 07:11 PM #12
Could you post a link for me to send to the BIL
Dave TTC
Turning Wood Into Art
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11th Jan 2017, 07:13 PM #13Senior Member
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Hi Dave,
Thats just a plain K type T/C
Step by step for the B-I-L. Unfortunately I didnt have any similar T/C on hand, but I did have some compensating lead, which is basically the same thing but with different, (lower rated), insulation. He may have teflon or fibreglass insulation but its the same method.
comp cable.png
So this is what I used. It still has the same chromel alumel metals as the T/C itself.
IMG_0276.JPGIMG_0277.JPG
1 Strip back about 30 mm of the sheath insulation, and if he has a shield wire make sure it gets snipped off and not mixed into the pair of wires. It must not short onto the T/C wires.
IMG_0278.JPGIMG_0279.JPG
2 Strip about 20 mm of each individual wire and give them a bit of light going over with emery to remove any oxidation.
IMG_0280.JPGIMG_0281.JPGIMG_0282.JPGIMG_0283.JPG
3 Cross the wires at an angle, and with a pair of pointy nose pliers grip them where they cross. Now with a pair of combination pliers grip the 2 ends (in line) and twist the wires tightly.
IMG_0284.JPGIMG_0288.JPGIMG_0289.JPG
4 Snip them back to about 10 mm and secure the T/C in a vise vertically. Apply a sprinkle of flux, (just bog standard pink brazing flux is fine) to the cold wires.
carburizing.JPGneutral.JPG
You dont want a carburizing or neutral flame.
oxidizing.JPGIMG_0294.JPG
5 With the smallest tip he has, (probably a #8, but a #6 is better) set the flame to a soft neutral and then bring it up to slightly oxidizing. (This provides a better pin point to the flame and cools it slightly) It should sort of whistle a bit. Apply a small amount of heat and sprinkle a little more flux onto the joint.
Unfortunately the camera couldnt cope with the welding step so you only get to see the finished result but hopefully the explanation is clear enough.
IMG_0295.JPGIMG_0297.JPG
6 With the torch held horizontally, about 20 mm above the wires, position the torch so the tip of the blue flame will be just touching the weld point when it is lowered into position. Now just smoothly lower your hand, keeping the torch tip horizontal, and the wires should fuse almost instantly into a neat ball. This really only takes less than a second. Dont dwell or you may cut the wires.
Cheers Phil
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11th Jan 2017, 07:16 PM #14Senior Member
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11th Jan 2017, 07:38 PM #15
Just found out the type my BIL used are T type. Excuse my ignorance as I dont know what that means
Dave TTC
Turning Wood Into Art
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