Brazing carbide tips

[michael lennonParticipant @michaellennon12510]

How do you braze carbide tips for lathe tools?

[michael lennonParticipant @michaellennon12510]

[Involute CurveParticipant @involutecurve]

I use gas welding kit and sifbronze No1, but pretty much any brazing rod will do and you could prbably get away with Map gas if its a small tool and tip.

[Ian S CParticipant @iansc]

I just use LPG, and what ever rod that comes to hand, I have used brass. I now have access to LPG and oxygen and will use that in future if I need it.

Ian S C

[Simon Williams 3Participant @simonwilliams3]

+1 from me for Sifbronze, though silver solder will also work, but not always. It seems there are some grades of carbide the flux won't wet, so the solder/braze won't run on to the insert. You just have to find a different grade of insert, though it might now be possible to use some of the more active fluxes and get a better result with these difficult examples. I've only tried doing this with J & M easyflo no 1 which is a pretty benign flux, and intolerant of dirt or funny oxides, so it isn't 100% guaranteed to work. I don't know the science behind this but you can certainly get good adhesion with most insert materials. If it works at all it'll be a good job.

I'm guessing, though I haven't tried the experiment, that coated inserts may also cause problems in getting the flux to wet them.

[Brian WoodParticipant @brianwood45127]

Simon,

Coated inserts are no problem, just use the proper Sifbronze flux and rods

Brian

[Keith HaleParticipant @keithhale68713]

Hi Michael.
See personal message.
Keith

Edited By CuP Alloys 1 on 21/10/2018 11:44:27

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