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First time brass brazing

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SwarfnStuff:
Hi Surf,
         Are you getting both bits cherry red? Interested to see if fresh flux helps, also interesting that the flux seems to run away from the cleaned part.
    You don't say how thick the 1" disk is and this may be critical as brass sure conducts the heat away from the joint area.

Good luck with it anyway,

John B

Joules:
How tight is your thread, you might want to chamfer the hole so your solder has more metal to key onto, or even use a needle file to add some grooves for the solder to wick into.  Dip your solder when warm into the flux so it also gets a coat at the tip.

See if you can buy/borrow some fresh flux.

awemawson:
Perhaps a few photographs of the components, and the result might help us visualise the issue  :scratch:

Silver soldered joints only need a few thou for 'wicking in'

Have you tried heating a sample of your brass to cherry red to check it survives the temperature?

DMIOM:
If the flux is beading / 'running away', I wonder if the surface might not be clean enough - have you tried de-greasing?

Dave

Fergus OMore:
I haven't seen the job but my thoughts are two fold.

The first is that there is too much heat and the second is that the wrong brazing/silver solder  is being used. I'd use a higher silver content and not blast the hell out of getting brazing rod to run.

My thoughts :doh:

Regards

Norman

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