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Adhesive joining
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Adhesives are now used for a huge range of applications, from very low strength uses ( paper glue ) to high strength uses ( epoxy resins ). They can be used to hold party hats together and they can be used to hold the wings on the aeroplane. This is a huge range. For success they have to be selected correctly and the joint has to be designed correctly. They rarely work well when used as a direct replacement for mechanical fasteners.
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Joint design Where ever possible ‘peel’ should be avoided in the joint design. The overlap or adhesive area should be as large as possible. The materials/assembly must be able to withstand any processes ( eg heat ) that is required to cure/harden the adhesive. Sketch 3 or 4 xamples.
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Advantages of adhesive
Reduce the number or parts required. Suited to factory/production type assemble. Can provide air/liquid tight joints ( no extra seals required ) Can join huge range of materials, including elastomers, glass and ceramics. Spread the load, preventing point failure or corrosion. Prevent unwanted dis-assembly. Prevent customer repair- have to buy a new one!
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Disadvantages of Adhesive
Parts can’t be dis-assembled easily. Chemicals used can be hazardous. Preparation, mixing and temperature can be critical.( field repairs are difficult ) Join design and adhesive selection are critical. Difficult to identify and source the correct adhesive for a repair. Most have expiry dates, after which they don’t work well. Time or a curing process ( eg UV , or heat) is required before use.
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Examples of adhesive Wood glue General purpose adhesive Solvent cement
Tensol Cyano-acrylates ( super glue ) Epoxy resins
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