Advertise on Bikeforums.net



User Tag List

Results 1 to 6 of 6

Thread: Flux removal

  1. #1
    meech151
    Join Date
    Apr 2009
    Location
    Mountain Home, AR
    My Bikes
    MEECH road & cross bike
    Posts
    206
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Flux removal

    Quick question about flux removal. I use Gas Flux brand fluxes on my frames along with the Gas Flux liquid system mainly because that is the way I was taught and haven't tried other brands. Their fluxes are supposed to wash off with warm water and most of it does, the silver-brazing flux always comes off easy but the flux that I use for brass/bronze always seems to leave a few hard spots that I have to file off or chip off, mainly around the BB shell. I imagine its from the heat but it is not burned up, just clear and hardened like ice. Any advice out there, any solutions to use that work well? I don't have a soaking tank, only a large sink or bathtub, but I would get one if it would make a difference.

  2. #2
    Old fart JohnDThompson's Avatar
    Join Date
    Nov 2004
    Location
    Appleton WI
    My Bikes
    Several, mostly not name brands.
    Posts
    12,604
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    Are you using the "Type B" paste flux? This should come off with hot water -- the hotter the better. Anything that sticks should come off with a little scrubbing from a wire brush.

  3. #3
    Senior Member sannerbikes700's Avatar
    Join Date
    Dec 2008
    Location
    Palo Alto CA
    Posts
    92
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    A 24 hour soak in soapy cold water tank works for me, then a bead blast. Hot water is probably quicker and easier though. I prefer Allstate #1113 paste because it seems to wash off a bit better.

  4. #4
    meech151
    Join Date
    Apr 2009
    Location
    Mountain Home, AR
    My Bikes
    MEECH road & cross bike
    Posts
    206
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for the info guys. I will look into the Allstate paste.

  5. #5
    Senior Member sannerbikes700's Avatar
    Join Date
    Dec 2008
    Location
    Palo Alto CA
    Posts
    92
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Allstate isn't that much easier to remove than the Gasflux, just a little. But give it a try, it's a bit cheaper too... and it smells like some sort of yummy fruit pie.

    Have you tried a high speed wire wheel (like on a die grinder) to get those stubborn globs off?
    Last edited by sannerbikes700; 01-29-10 at 10:18 PM.

  6. #6
    Senior Member Nessism's Avatar
    Join Date
    Jun 2004
    Location
    Torrance, CA
    My Bikes
    Homebuilt steel
    Posts
    2,324
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Soak over night is what I recommend. Using a heater in the water is also good. Flux is acid and needs to be removed. Those hard chunks on the outside the tubes are also inside the tubes as well (too a lesser extent of course) so mechanical flux removal from the outside is not good enough - you need water to get inside the tubes to get all that stuff off otherwise you can have corrosion attacking the joints from the inside out.
    Becareful buying/selling bike parts on-line. I learned the hard way. :(

    Good/Bad Trader Listing

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •