Silver solder

[BOB BLACKSHAW 1Participant @bobblackshaw1]

I am silver soldering a copper boiler and have used two melting point rods. A part that has been solder using high melting rods I think has not quite taken, is high and low rods compatible if used together. When I use the low melting rods I want to touch up one of the bronze bushes.

Bob

[BOB BLACKSHAW 1Participant @bobblackshaw1]

[Gary WoodingParticipant @garywooding25363]

Yes, no problem. Note also that once a solder has been melted it usually remelts at a higher temperature, thus you can solder near an existing joint with the same grade solder without necessarily melting it.

[Keith HaleParticipant @keithhale68713]

Hi Bob

If you have a joint that is suspect, then at some point you did something that hindered the capillary flow of the silver solder.

Did you use a flux that suited the parent materials?

Did the whole of the joint achieve brazing temperature? Did the alloy get it's heat from the joint not the torch?

Did you create a heat pattern to promote the required alloy flow?

For more information see the videos http://www.cupalloys.co.uk

**LINK**

 

Regards

Keith

Edited By CuP Alloys 1 on 05/12/2019 09:23:31

Edited By CuP Alloys 1 on 05/12/2019 09:24:44

[BOB BLACKSHAW 1Participant @bobblackshaw1]

Thanks for the replies which has helpt me a lot here. This is the first time for a large silver soldering area that I've done and so far it has not come out to bad, but if starting again could of done it better.

My next dumb question is pressure testing it, obviously a non return valve. I was thinking of using a cycle valve but this would melt the rubber washer when making a fitting into the 1/4 ME thread bush, not sure what thread the cycle valve is and will mean buying a cycle innertube.

What other ways of doing this please

Bob.

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