Bonding Ultrasonic Transducer Horn

Discussion in 'General Electronics Chat' started by Mad Professor, Nov 17, 2011.

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  1. Mad Professor

    Thread Starter Active Member

    Apr 15, 2009
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    Good day all.

    I own a Kerry ultrasonic cleaning bath, but the ultrasonic transducer horn has started coming away from the base of the tank.

    Can anyone here recommend what compound to use to rebond the ultrasonic transducer horn to the base of the tank?

    The ultrasonic transducer horn is made out of aluminium, and the tank is stainless steel.

    The ultrasonic transducer horn looks very much like this one:
    [​IMG]

    Thanks for your time.

    Best Regards.
     
  2. shortbus

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    Sep 30, 2009
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  3. guhankannan

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    Jun 21, 2013
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    ultrasonic circuit diagram regarding
     
  4. atferrari

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    Jan 6, 2004
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    Is that a question?

    Could you rephrase it?
     
  5. Metalmann

    Active Member

    Dec 8, 2012
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    I would try clear silicone.
     
  6. studiot

    AAC Fanatic!

    Nov 9, 2007
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    I am not familiar with you cleaning machine, but have done quite a bit of ultrasonic testing.

    My experience suggests that you should not use a bonding agent that sets hard or rigid if the u/s wave has to pass through it.

    It is normal to use a 'coupling gel' in u/s testing. Wallpaper paste works well, but would not be strong enough for mechanical support.

    Perhaps the silicone suggestion will work.

    Or bond it round the rim only and dam a coupling fluid inside.

    go well
     
  7. ErnieM

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    Apr 24, 2011
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    Gee, back when we put an ultrasonic transducer inside a submarine to check how much water was inside a nuclear reactor (seriously, I did that) we just used a thin coat of oil. In that setup the transducer had a spring holding it to the tank.

    Vaseline also works well,as does just plain water.

    A thin coat of just about any epoxy should do the trick permanently. You want a thin coat with few bubbles as bubbles scatter the wave.

    As any boat using a thru hull depth sounder needs epoxy to stick it down to the boat any marine store should have *exactly* what you want.
     
  8. GopherT

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    Nov 23, 2012
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    Any bonding agent that is flexible will absorb ultra-sonic energy and, the more rigid the better the U/S energy will be transmitted. The concerns is that a very rigid bonding agent will be blown apart by the ultrasonic energy (similar to what happened already - apparently). If you see any rigid epoxy laying around the old bonding area, try to find something less rigid (expect a less powerful sonic bath).

    Dow, 3M and Henkel each have excellent acrylic, epoxy and urethane structural adhesives that will bond aluminum to stainless steel. Use their product selector to enter the two different materials you are bonding. The stronger the adhesive for your substrate (Al and SS), the more rigid adhesive you can select, and more energy transmitted.
     
  9. studiot

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    Nov 9, 2007
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    My practical experience can't agree with this, nor would it be considered best practice.

    Any boundary between a rigid adhesive and the bonded metal will appear on test as reflection surface. There will, of course be two such boundaries for an adhesive.

    The fluid couplant appears transparent to the u/s waves.

    Sorry I no longer do this stuff so cannot show scope pictures, perhaps some other member has access to u/s testing gear and can do this?
     
  10. paulktreg

    Distinguished Member

    Jun 2, 2008
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    The ultrasonic cleaners I've worked on have used a very hard adhesive to bond the crystals. Perhaps something like liquid metal would do the job? The only problem I see is whatever adhesive you use you may only get one chance to get it right.
     
  11. Markd77

    Senior Member

    Sep 7, 2009
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    I suspect Mad Professor has solved it of given up already, the thread started in 2011. The new question (in the loosest possible definition) is:
     
  12. studiot

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    Good catch Mark

    :)
     
  13. Wendy

    Moderator

    Mar 24, 2008
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    Guys, this is pure necroposting, along with a hijack. Since the OP seems to be finished with this thread I'm shutting it down. If someone wants to continue the conversation please pick it up elsewhere.
     
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