Almost every product is made of more than one part, so at some point those parts have to be joined. Joining (the category defined in A4.1.1) assembles separate components into one working product, and it can bring together similar materials or very different ones, like metal and plastic.
There are five techniques to know: adhering, fastening, stitching, weaving and welding. The biggest split is temporary joins (fastening, stitching, weaving) that can usually be undone, versus permanent joins (welding, adhering) that normally cannot.
Adhering
The act of sticking or bonding materials together, often using an adhesive like glue.
Adhering bonds parts together with a glue rather than a mechanical part. The right adhesive depends on the job.
| Adhesive | Characteristics | Common application |
|---|---|---|
| Epoxy resin | Strong and durable | Aerospace and automotive |
| Cyanoacrylate (super glue) | Fast-setting | Small, precise jobs |
| Polyurethane | Flexible and water-resistant | Construction and furniture |
Fastening
A device or method used to secure one material to another, such as screws, nails, or clips.
Fastening holds parts together with a separate mechanical device. Three fasteners cover most needs:
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