tag:blogger.com,1999:blog-8167306371927235942.post6708214393840718899..comments2023-05-21T01:08:37.583-07:00Comments on Fellet Brazing: Getting thereFelletBrazinghttp://www.blogger.com/profile/11909339315290181196noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-8167306371927235942.post-51270585549567666412008-04-16T07:04:00.000-07:002008-04-16T07:04:00.000-07:00That's the flux. It keeps the steel from oxidizin...That's the flux. It keeps the steel from oxidizing during the brazing process, and is also pretty acidic to keep the tubes clean. The cleaner the tubes, the better the filler will bond to the steel.<BR/><BR/> It goes on as a gooey paste. Then as the tubes are heated, the water boils off, and leaves the solid flux on the tubes. Once it hits operating temperature, it melts into a clear goo. You can see it if you look where the braze actually is. (Then farther away from the heat, it's still the white pasty stuff that is what's left after the water boils off.) But at the point of these pictures, the clear goo has already cooled down, and has solidified into something almost like cured epoxy. But it's water soluble, so a good soak in hot water breaks it up.FelletBrazinghttps://www.blogger.com/profile/11909339315290181196noreply@blogger.comtag:blogger.com,1999:blog-8167306371927235942.post-76046051538385833582008-04-15T20:30:00.000-07:002008-04-15T20:30:00.000-07:00What's all that white stuff on the tubes?What's all that white stuff on the tubes?Casey Rybackhttps://www.blogger.com/profile/15004336110624800873noreply@blogger.com