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Silver soldering problem

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BOB BLACKSHAW02/07/2018 11:18:17
334 forum posts
68 photos

I made a mistake on a brass part that can be repaired with a fill in of silver solder using Easy- Flow flux, all went well on this yesterday.

Today making another using the same brass I again made the same mistake, but this time the solder would not take it just run off in ball. I cleaned the brass using a wire brush and diamond needle file as yesterday, tried several times but would not take.

I've muck it up now by using a brazing rod which did take but melted the edge of the job.

Any idea why the silver solder worked a treat on one but not the other, as they came off the same 44mm round brass.

Thanks Bob.

Mick B102/07/2018 11:44:33
1717 forum posts
91 photos

Did you use enough flux? In my own tentative forays into silver soldering I've found I had to paint on quite a coating.

Still scares me, and I'll bolt the joint instead if I can...

Brian Sweeting02/07/2018 12:00:58
442 forum posts
1 photos

You say that you melted the end of the job.

If you overheat the base then the filler will simply run off, the flux has already benn burnt away.

BOB BLACKSHAW02/07/2018 12:15:16
334 forum posts
68 photos

I melted the edge of the job when using a brazing rod, but that did take, not the silver solder.

CuP Alloys 102/07/2018 14:37:37
258 forum posts
Hi Bob.
Email details to me with the grade of silver solder you are using.
If the solder melts but don't wet the brass you have a flux problem. The flux is not compatible with the solder/heating technique/parent materials.
Bob Stevenson02/07/2018 16:18:06
432 forum posts
7 photos

Either contamination or a flux failure.....

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