Thermocouple welder

[DaveTTC]

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

[jhovel]

There are two people in Horsham who can do that for you: their names are Peter Hart and Jayson..... both are on this forum.

[DaveTTC]

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

[jcge]

Dave

If you're looking to join K type, you can just twist the wires and then silver solder

John

[DaveTTC]

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

[12bolts]

Dont do this
just twist the wires and then silver solderYou can generate false readings.
They arent that difficult to just weld with oxy/acet. In a previous life I used to make large numbers of thermocouples as part of my job. If your B-I-L wants a bit of instruction I am happy to write it up

Cheers Phil

[DaveTTC]

Dont do thisYou can generate false readings.
They arent that difficult to just weld with oxy/acet. In a previous life I used to make large numbers of thermocouples as part of my job. If your B-I-L wants a bit of instruction I am happy to write it up

Cheers Phil
That would be great Phil

Dave TTC
Turning Wood Into Art

[12bolts]

Dave,
Ask the B-I-L if he is using plain open wire TC's or sheathed.

Cheers Phil

[DaveTTC]

Will do

Dave TTC
Turning Wood Into Art

[DaveTTC]

This is the two pics he sent

https://uploads.tapatalk-cdn.com/20170110/da8c93e3dff599611584de59b6034f65.jpg

https://uploads.tapatalk-cdn.com/20170110/62d6d80fa231d3f1d2395bffed9620ca.jpg

Hope that helps

Dave TTC
Turning Wood Into Art

[jhovel]

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 Tapatalk

[DaveTTC]

Could you post a link for me to send to the BIL

Dave TTC
Turning Wood Into Art

[12bolts]

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.
366158
So this is what I used. It still has the same chromel alumel metals as the T/C itself.

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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.

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2 Strip about 20 mm of each individual wire and give them a bit of light going over with emery to remove any oxidation.

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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.

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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.

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You dont want a carburizing or neutral flame.

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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.

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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

[12bolts]

Those look fusion welded.
T/C are always fusion welded. Any inclusions of other dissimilar metals will generate false readings

Cheers Phil

[DaveTTC]

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

[jhovel]

Dave, here is the link to the torch. It's tips go from #1 to #6
SMITH(23-1001C) Micro Precision Oxygen Butane Welding Torch Kit
https://banggood.app.link/coeYaLmqQz

[DaveTTC]

Thx Joe

Thx Phil for the comprehensive build. Knowing nothing about this stuff ... can that build be applied to 'T type'?

Dave TTC
Turning Wood Into Art

[12bolts]

Dave
Yes it can, I will have to drag out my old books to check the flux required 'tho. T type T/C are an older type (Copper and Constantan conductors) more suited to low temp stuff. Cryogenics especially.
It seems that you need acid

Cheers Phil

[DaveTTC]

I sent my BIL a link for the thread. He appreciates everyones input

Dave TTC
Turning Wood Into Art

[Michael G]

Another option may be one of these -
FDA Dental Spot Welder Heat Treatment Stainless Steel Easy Operate FREE SHIPPING | eBay (http://www.ebay.com.au/itm/FDA-Dental-Spot-Welder-Heat-Treatment-Stainless-Steel-Easy-Operate-FREE-SHIPPING-/171879726095?hash=item2804d47c0f:g:ttAAAOSw9N1Vvw5A)

Michael

[DaveTTC]

Thx Michael.

I would forward that to my BIL

DaveTTC

Turning Wood into Art