Transcript Joining Metals - Thurso High Technologies

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
Bolting
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
Hammer
Rivets are available
in a wide range of
shapes, sizes, and
Materials
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
disassembled
Semi Permanent Joining
Pop Rivet Gun
Pop Riveting
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
tube.
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