welding, fastening sheet metal

1. FASTENING
SHEET METALS

2. Sheet metals are joined or fastened together using different methods such as
riveting, the use of sheet-metal screws, spot wielding and the use of epoxy
cement.
RIVETING- is the process of joining together two or more sheets of metals
permanently using rivets.
Rivets are metal pins with bends. They are usually made aluminum, iron or
copper. They are sold in packages one five pounds or in boxes of ton.

3. The most common head of
rivets are shown below.
Riveted Sheet Metals

4. There are also blind rivets. These
rivets are usually made of
aluminum. They can be purchased
by piece.
Riveting Using a Ball
Peen Hammer
The following steps are followed to in
riveting sheets metals using a ball
peen hammer:
1.Provide holes for the rivets.
2. Put the rivets through the holes
placing the head against the steel
block.
3. Strike the top end of the river with
the flat face of a ball peen hammer
until the rivet shank becomes quite
round.

5. Ball Peen Hammer

6. Riveting using Using a Hand Riveter
These are the steps in riveting using a
hand riveter:
1. Drill holes on the metals intended for
the rivets using a drill bit.
2. Insert the mandrel of the rivet into the
hand riveter.
3. Put the shank of the rivet into the
hole and squeeze the handle of the tool
until the mandrel of the rivet breaks off.

7. Sheet Metal Screws
Sheet Metal screws are useful
in installing aluminum
frames, vehicles, and small
types of works made of sheet
metals.
The following are the
commonly used sheet metal
screws.
Sharp-point screws- These are
used if the holes are difficult to
align. They are also used if the
materials to be joined are higher
than the ordinary screw.
Blunt- end screws – These are
intended for fastening sheet metals
from 0.48 to 5.18 mm thick.

8. Installing Sheet- Metal
Screws
The following steps are used in
installing sheet- metal screws:
1. Lay out the portions to be
drilled.
2. Provide punch marks for the
center points.
3. Drill holes
4. Line up the holes and make
sure that the metals are held
together firmly.
5. Fasten the screw with a
screwdriver.