Joining and Assembling

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  • Joining and Assembling
    • Permanent Joining
      • Welding
        • Heating area of joint until material melts and runs together.
        • Processes for metal includes manual metal.
        • Welding and metal insert gas (MIG) welding.
        • MIG welding can be automated for large quantities.
        • Welding for thermoplastics include hot plate welding, hot wire welding and friction welding.
      • Brazing and Soldering
        • Brazing uses heat to join metals.
        • Parts are not melted-brazing material flows into joint.
        • Soldering is similar to brazing. mainly used to attach components to circuit boards.
      • Riveting
        • Used in applications such as attaching the skin to aircraft.
        • Inserted into holes into overlapping pieces of material.
        • Ends made to hold materials in place.
      • Adhesives
        • Wide range of adhesives available to bond parts.
        • Different adhesives used for different materials.
        • Common adhesives:
          • Epoxy resin.
            • Joins metals, plastics, composites.
            • Polymer which comes in 2 parts.
            • Hardens when mixed together. Mixed immediately before use.
          • Acrylic cement
            • Joins acrylic and some types of thermoplastics.
            • Melts surface of plastics and fuses it together.
          • Polyvinyl acetate (PVA)
            • General purpose glue for woodwork.
    • Temporary Joining
      • Possible to make temporary joints by crimping parts together: twisting wires in electrical circuit.
      • Mechanical applications temporary joints often mades using threaded fastenings.
      • Include: nuts, bolts, screws.
      • Available in wide range of materials: steel, brass, different thermoplastics.


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