joining metals by 4T2tc7


									Joining Metals
Non Permanent Joining

 A Bolt is a threaded fastener
 that passes through the work
 piece and is held in place by a
 nut on the other side. This is a
 very common way of holding
 together temporary and
 permanent constructions
Non Permanent Joining   Self Tapping Screws

                        A Self-tapping screw has a sharp thread
                        and that cuts its own thread, it is often used
                        To join thin sheet metal and plastics
Semi Permanent Joining
Riveting           The tools used
                   when riveting are
                   the Rivet Set &
                   Snap and a Ball Pein

                   Rivets are available
                   in a wide range of
                   shapes, sizes, and

                                          Another traditional method
                                          of joining metal is
                                          Riveting. This process is
                                          classed as semi
                                          permanent in so far as the
                                          rivets can be drilled out
                                          and the product
Semi Permanent Joining        Pop Riveting

         Pop Rivet Gun   Pop Rivets

                                      A Pop Rivet is a quick
                                      method of joining
                                      sheet metal together.
                                      This process is often
                                      used to join sheet
                                      material to a hollow
Using The Pop Rivet Gun
         Lazy Tongs

This is an alternative to the pop rivet
gun. Lazy Tongs are much easier to
use when fitting a lot of rivets.
Permanent Joining                           Welding
                             Welding is a joining process that involves heating
                             both work pieces up to melting point. Commonly,
                             work pieces are welded by melting them and
                             adding more molten metal to form a pool that cools
                             to form a strong joint.
                             The heating of the metal can be a achieved a
                             number of ways- Electricity, Gas or Friction

The picture on the right
shows Electric Arc Welding
Permanent Joining
                                                  Spot Welding

Spot welding is principally used as a method of joining sheet steel. The
process is used extensively in the Automobile industry where the spot welding
process can be automated with the aid of robots. Spot welding can be
undertaken in the school workshop (on a much smaller scale) as follows.
      Permanent Joining                       Brazing
                                     Brazing is a process suitable for joining
                                     pieces of mild steel (ideally of similar
                                     thicknesses). The process relies on the
                                     use of a brass filler rod which, when
                                     molten, is drawn by capillary action into
                                     the small gaps between the two pieces
                                     if steel.

This method of joining metals uses
very high temperatures (around
900 C) and produces a strong joint
with minimum distortion of the
original work pieces
Permanent Joining
                       Epoxy Resin adhesive
                    Epoxy resin adhesives are generally two part
                    adhesives (Adhesive & Hardener) When
                    mixed they can be used to bond most
                    materials. Typically Wood, Ceramics, Glass,
                    Metals, Rubber, Fabric, Leather and most
                    Hard Plastics.
The End

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