Silver Soldering Tungsten Tig Electrodes to Mild Steel

[JasonBModerator @jasonb]

As the title suggests for the ignitor on my 1/3rd scale Galloway hit & miss engine I have to solder some Tungsten to mild steel. Is there anything I should watch out for?

I intend to use Easyflow and Tenacity No5 unless you know better.

Thanks, J

[JasonBModerator @jasonb]

[pierre ehly 2Participant @pierreehly2]

Hi,

Carbide brazing process explained here

21-jan-2013

Read "Popular mechanics oct 1952"

http://books.google.fr/books?id=jdwDAAAAMBAJ&pg=PA211&lpg=PA81&ots=KUR9lUj5EQ&dq=popular+mechanics+oct+1952&hl=fr

pierre

[Gary WoodingParticipant @garywooding25363]

Hi JasonB,

That should work OK.

[Frank.N StormParticipant @frank-nstorm18349]

Posted by pierre ehly 2 on 10/09/2013 09:40:57:

Hi,

Carbide brazing process explained here

He asked about brazing Tungsten, not carbide. Or do you want to say the same process can be applied?

(Hint: read the question before answering…)

Frank

[Keith HaleParticipant @keithhale68713]

Hi Jason,

Proceed as you thought with your silver solder and flux.

Keep joint gaps small say 2-3 thou.

Use propane to heat so you get good all-round heating of the joint.

Allow to cool slowly.

Regards

Keith

PS Same approach when brazing/silver soldering of small pieces of carbide

[JasonBModerator @jasonb]

Thanks for all the replies particularly Keith.

I the past I have used carbide from blunt cutters but as this one needed 3/32" rod the suggested TIG electrodes seemed the better option and I just wanted to know if the lack of carbon in the metal needed a different approach.

As you can see the small round contact on the hammer wetted well, the longer rod comming out of the conical part not quite so well but I could not pull or twist it out so must be OK.

For those that are not sure how an ignitor works this shows it being tripped by the pushrod.

J

[Author]

Posts