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Adhesive joining

Adhesive joining.

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Adhesive joining

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  1. Adhesive joining

  2. 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.

  3. 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.

  4. 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!

  5. 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.

  6. Examples of adhesive • Wood glue • General purpose adhesive • Solvent cement • Tensol • Cyano-acrylates ( super glue ) • Epoxy resins

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