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Materials Technology Joining Processes

Materials Technology Joining Processes. Overview – Joining Materials. OPTION The student will learn about… The methods by which materials are joined – permanent and semi-permanent techniques The student will be able to…

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Materials Technology Joining Processes

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  1. Materials Technology • Joining Processes

  2. Overview – Joining Materials • OPTION • The student will learn about… • The methods by which materials are joined – permanent and semi-permanent techniques • The student will be able to… • Demonstrate a knowledge of the main methods of joining materials – metallurgical processes, mechanical joining and adhesive/chemical bonding

  3. Overview – Joining Processes • JOINING TECHNIQUES P = Permanent NP = Non-permanent NP P P P NP P P P P P P

  4. JOINING PROCESSES • MECHANICAL • Screw Fasteners • These are non-permanent methods of joining materials. There is a very wide variety of screw fasteners available they include; • Woodscrews • Self-drilling/tapping screws • Machine screws • Furniture screws • Bolts • Compression Joints

  5. JOINING PROCESSES • MECHANICAL • Screw Fasteners • Woodscrews

  6. JOINING PROCESSES • MECHANICAL • Screw Fasteners • Woodscrews Wood Screw Pozi Head CSK Wood Screws Round Head Slotted

  7. JOINING PROCESSES • MECHANICAL • Screw Fasteners • Furniture Screws Furniture Screws & ‘Knock Down’ fittings

  8. JOINING PROCESSES • MECHANICAL • Screw Fasteners • Knock Down Fittings

  9. JOINING PROCESSES • MECHANICAL • Self Drilling/Tapping Screws

  10. JOINING PROCESSES • MECHANICAL • Machine Screws

  11. JOINING PROCESSES • MECHANICAL • Bolts Hexagon Flange Bolts Chrome Hexagonal Bolts Hexagon Socket Head

  12. JOINING PROCESSES • MECHANICAL • Nuts & Washers

  13. JOINING PROCESSES • MECHANICAL • Compression Fittings Straight Coupling Equal Tee Used primarily in plumbing applications

  14. JOINING PROCESSES • MECHANICAL • Pop Rivets Pop Riveting Tool with Threaded Inserts This is a permanent joining process

  15. JOINING PROCESSES • MECHANICAL • Rivets Snap Head Rivet Countersunk Rivet These are used for permanent joints in steel plate

  16. JOINING PROCESSES • METALURGICAL • Soldering Electric Cable Replaceable Tip Insulated Handle Electric Soldering Iron

  17. JOINING PROCESSES • METALURGICAL • Soldering Soldering Iron Stand Soldering Wire

  18. JOINING PROCESSES • METALURGICAL • Soldering a Component on • A Circuit Board Component Lead Soldering Iron Circuit Board Foil The soldering iron tip is placed against the lead and the circuit board foil. Both are heated for 3 or 4 seconds

  19. JOINING PROCESSES • METALURGICAL • Soldering a Component on • A Circuit Board Cored Solder Wire The solder is applied to the lead opposite the soldering iron. It is the heated lead and circuit board foil that melts the solder

  20. JOINING PROCESSES • METALURGICAL • Soldering a Component on • A Circuit Board Molten Solder As the solder melts it flows around the connection and forms a good conductive joint with the foil. The soldering wire and the soldering iron are then withdrawn and the joint is allowed to cool

  21. JOINING PROCESSES • METALURGICAL • Brazing Firebrick Brazing Torch Brazing Hearth

  22. JOINING PROCESSES • METALURGICAL • Brazing Whole of joint area is heated and it is the heated joint that melts the Spelter Brazing Torch Brazing Rod (Spelter)

  23. JOINING PROCESSES • METALURGICAL • Brazing Typical Brazing Applications

  24. JOINING PROCESSES • Adhesives • Natural Adhesives • These are made from natural ingredients rather than being fabricated synthetically from chemicals. • Sources • Animal based • Fish based • Vegetable based

  25. JOINING PROCESSES • Adhesives • Natural Adhesives • Some natural adhesives have the following properties, they can be; • Strong • Flexible • Waterproof • Soluble in water • Transparent However they are not as strong as synthetic adhesives and are usually more expensive

  26. JOINING PROCESSES • Adhesives • Natural Adhesives • Are often used in furniture and architectural restoration projects • They are also friendlier to the environment; • No chemicals released into the soil or atmosphere in production or use • No aggravation of chemical based allergies • Manufactured from renewable resources

  27. JOINING PROCESSES • Adhesives • Elastomer Adhesives • Are based on natural and synthetic rubbers. They set by solvent evaporation or heat curing. Used for flexible bonds in plastics and rubber

  28. JOINING PROCESSES • Adhesives • Thermoplastic Adhesives • Are fusible, soluble but with poor heat and creep resistance

  29. JOINING PROCESSES • Adhesives • Thermoset Adhesives • High strength, suitable for high load assemblies and resistant to heat and cold. Comparable with the strength of welded or riveted joints

  30. JOINING PROCESSES • Adhesives • Toughened Adhesives • Research has led to the development of high strength, toughened adhesives. • They have small rubber-like particles dispersed throughout the glassy matrix. • This gives the adhesive a high resistance to crack formation

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