Aluminum adhesives
Aluminum adhesives
(OP)
I'm considering adhesive bonding as an alternative to riveting for a 2024-T3 aluminum sheet metal structure for a one-off project. Since it's a one-off, and my company hasn't used structural adhesives on any major projects in the past, I don't have the budget for (or access to) any curing tools more expensive than heat lamps. I'd also like something can can cure to full strength in two days or less under those circumstances, preferably less than 24 hours. I need suggestions about products to look into and references on joint design and surface preparation. Thx in advance and all that.





RE: Aluminum adhesives
RE: Aluminum adhesives
RE: Aluminum adhesives
In any case call, do not email, and have the data sheets emailed to you.
A
RE: Aluminum adhesives
Loctite Design Guide for Bonding Metals (LT-3371a vol4)
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Redux Adhesives Selector Tool
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REDUX BONDING TECHNOLOGY
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Other information from Hexcel on sandwich panels, design with honeycomb cores, etc.
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MIL-HDBK-337 ADHESIVE BONDED AEROSPACE STRUCTURE REPAIR
MIL-HDBK-691B ADHESIVE BONDING
MIL-HDBK-725 ADHESIVES
http://assist.daps.dla.mil/quicksearch/
Defence Standard 03-2 Cleaning and Preparation of Metal Surfaces
DEF STAN 00-970 Part 7/1 Section 4 Detail Design and Strength of Materials (Leaflet 402)
http://www.dstan.mod.uk/
RE: Aluminum adhesives
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Aluminum adhesives
Surface Preparation and Pretreatment of Structural Adhesives
-Ciba Adhesives
RE: Aluminum adhesives
Remember that rivets still help to hold things in place when the adhesive is curing, but you can use smaller (and fewer) rivets.
RE: Aluminum adhesives
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Aluminum adhesives
For surface preparation see: ht
If your company has not done bonding before, and you're on limited budget, it seems like you are taking a bit of a chance. How critical is the application?
RE: Aluminum adhesives
RE: Aluminum adhesives
RE: Aluminum adhesives
If the joint is a safety critical joint you may want to speak to their technical people, remember adhesives such as these work on aero structures & can join differing materials.
The joint is only as good as the materials it is joining & a test of the adhesive is good practice.
The secret with any adhesive is:
1)The surfaces have got to be a good mechanical fit - ie the two surfaces have to be compatible geometry.
2)Surface preparation, ideally the surfaces need to be rough NOT smooth (roughen with emery or score with blade. Increasinfg roughness increases surface area & allows the adhesive to key.
3) Then the surface needs to be clean & grease free, use detergent & water to clean the surface, then use solvent (that has fast air evaporation - in UK Tricloroethane type properties). From here you dont touch the surfaces with you bare fingers (oils in skin etc)
4) the adhesive has to be accurateley mixed (with catalyst type hardener) - no rough guess work allowed.
5) observe the temperature part of the instructions - if in a cold climate it takes longer to set.
6) spread the adhesive onto both surfaces with clean spreader spatula.
7) Bring the components together & postion the joint as its meant to be located (adjust) - apply pressure to close the joint - but dont use that much pressure or weight that theadhesive is squeezed out.
8) let the adhesive cure for the full time stated in instructions.
Decide whether the joint is to be subjected to extremes of cold or wet environments.
Good Luck !
Bruce L Farrar.
Works Engineering Manager
Marshalls Mono PLC.Brookfoot Works.
Halifax W.Yorks UK
RE: Aluminum adhesives