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Old 12-08-2009, 07:11 AM #1
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Looking for something stronger than JB Weld.

I'll be bonding stainless steel to aluminum, is there anything better suited for this application than JB Weld?
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Old 12-08-2009, 08:54 AM #2
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thats going to be a hard one. the very different melting points of the metals will be a problem. as well as the metals them selfs. if i were you i would try to find a way to screw them together if at all possible. a second option would be a press fit. not saying its impossible to weld but i am not aware of any welding rod or filler that would do it and if their is one it may be extremely expensive.
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Old 12-08-2009, 12:47 PM #3
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jb weld =/= real weld.

either way, fasteners or some variety of press fit would be better, and the press fit not so much if it's going to be exposed to any sort of temperature changes (different coefficients of thermal expansion, gets cold out, and the aluminum will fall right out of the stainless).
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Old 12-08-2009, 01:34 PM #4
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depending on the amount of press and assuming that its aluminum into stainless but ya thats generally pretty accurate
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Old 12-08-2009, 04:15 PM #5
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aluminum brazing rod.
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Old 12-08-2009, 04:51 PM #6
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Quote:
Originally Posted by ‹GOD› View Post
I'll be bonding stainless steel to aluminum, is there anything better suited for this application than JB Weld?
you could try riveting it together, but the electrolysis is always a facter when dealing with 2 different metals.

try a 2 part epoxy made for aircraft or something that requires specific tolerances.
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Old 12-08-2009, 07:30 PM #7
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what are u trying to do? I can point you in the right direction.
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Old 12-08-2009, 08:13 PM #8
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lab metal. it is very strong. stronger than aluminum
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Old 12-09-2009, 03:48 AM #9
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Well here's the application, I'm putting some threaded inserts into a severely stripped out body. Already looked into helicoil but that wont work the way I need.

The nut like insert will be pressfit and epoxied in place, I'm just trying to find something better suited than JB Weld. Any type of welding is probably not going to get the job done given the different materials which is why I'm exploring epoxies.
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Old 12-09-2009, 05:56 AM #10
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well if your going to do something like that why dont you just make some round nuts out of aluminum and then you could weld them in.
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Old 12-09-2009, 06:36 AM #11
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There's not enough depth to work with, aluminum threads wont to hold up.

I've heard attempting to weld alum is very difficult and not real cheap. Any truth to that?
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Old 12-09-2009, 07:12 AM #12
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well yes and no doing it your self is nearly impossible unless you already have the equipment and if you don't its going to cost over 500 to get started. you need a tig welder with argon gas and special filler rods. if you took it to some place that calls it self a welding shop they would most likely be able to do it the only thing they might not have is the filler rods. if you did that i bet it would not cost you to much i would say 10-30 bucks depending on how they feel and how busy they are.

what are you doing that aluminum threads will not hold up? are you using excessive pressure or ludicrously fine threads or are you only going to catch like one or two threads. what would be really helpful would be a pic of what your trying to do along with a description
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Old 12-09-2009, 07:56 AM #13
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just clean out the holes, use the rod, then thread into the actual rod material itself.
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Old 12-09-2009, 02:03 PM #14
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Quote:
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what are you doing that aluminum threads will not hold up? are you using excessive pressure or ludicrously fine threads or are you only going to catch like one or two threads. what would be really helpful would be a pic of what your trying to do along with a description
There is not enough depth to make a suitable amount of threads from aluminum.

No pictures are necessary, I have a very simple question. A steel insert is going into a piece of aluminum, it will be press fit and epoxied. What is the best epoxy to use?

Don't over-complicate this simple task.

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just clean out the holes, use the rod, then thread into the actual rod material itself.
Interesting, I'll look into that.
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Old 12-09-2009, 03:40 PM #15
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http://dowglobal.ides.com/PFMainLink...&CULTURE=en-us

this is the whole inventory of dow products epoxy resins pick your requirements and pick you product then find someone who sells it. doing your own research is always a good idea its how we all learn. as for my pick i would choose D.E.R 351 looks like it has a low viscosity so that it can creep into your joint and create a good seal.
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Old 12-09-2009, 03:56 PM #16
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Originally Posted by nerve2030 View Post
http://dowglobal.ides.com/PFMainLink...&CULTURE=en-us

this is the whole inventory of dow products epoxy resins pick your requirements and pick you product then find someone who sells it. doing your own research is always a good idea its how we all learn. as for my pick i would choose D.E.R 351 looks like it has a low viscosity so that it can creep into your joint and create a good seal.
Thanks for your help, just needed some one to point me in the right direction.
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