repair resin bonding

<sigh>

Temperature?

Pressure?

What's in the tank?

the tank holds a cleaning soultion that can be heated up to 200 deg f. the piezoelectric transducers are mounted on the external bottom of the tank and weight about 2 lb's. they aren't under any pessure just the pull of gravity.

<cleaning soultion>

Water with washing-up liquid?

Daz?

Omo?

Cillit Bang?

Trichloromethane?

Petrol?

What?

Is it smelly?

Just use a two part resin to re-attach it to the tank.

John.

Is there any resin type or manufacture that you would recommend?

I've used Araldite epoxy resin before now for this type of job...

But it does depend on the tank material, if its stainless steel you should be okay, I can't imagine its plastic, but if it is you will have to talk with the manufacturer to see about chemical compatibility.

The important point is that the resin must be coated over the face of the transducer and in contact with the tank to give maximum power transfer.

John.

thank for the info

visit the 3M, fusor or duramix web sites for their two parts components for plastic repair and adhesives. Considered using fiber glass resin?

Do not forget to slightly rough up both surfaces first, fine glass paper for example and then intimately clean and degrease. I use Methylated Spirits for that, then do not touch the surfaces with your fingers anymore, coat with your Epoxy and press into place....

Not cleaning properly is probably the reason they fell off in the first place.....

We had a manufacturing plant in Florida years ago and they had at one point to glue a rod into a casting with Loctite. 3 out of 4 did not pass a test for stability, because the process forgot to mention cleaning and they had just come from the machine shop greasy!!

Once I got the process doc changed, 100% stayed glued the first time!!!!!

You say some of the transducer has come loose. Does that mean some of the bonding agent has cracked and fallen out or the transducer is hanging and swaying in the breeze? I am imagining the transducer is one piece. The quick and dirty fix is too clean and sand as best you can and I doubt it would be 100%, then fill with a 2 part epoxy. No guarantees.

The better is give it a whack with a hammer and break it loose then clean and sand completely both surfaces and reset. It's possible it will come off with some of the bonding resin still totally bonded to the cleaner or the tank. Getting it all off may be difficult and or impossible.

Getting a new transducer and relocate it near the old one but on a preparable surface might be a good idea and would probably have guaranteed results if done properly. The other methods have some risks.