Silver soldering problem

[BOB BLACKSHAW 1Participant @bobblackshaw1]

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.

[BOB BLACKSHAW 1Participant @bobblackshaw1]

[Mick B1Participant @mickb1]

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 Sweeting 2Participant @briansweeting2]

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 BLACKSHAW 1Participant @bobblackshaw1]

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

[Keith HaleParticipant @keithhale68713]

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.
Regards
Keith

[Bob StevensonParticipant @bobstevenson13909]

Either contamination or a flux failure…..

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