Chapter 2 - Soldering Technique
Transcript of Chapter 2 - Soldering Technique
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SOLDERING TECHNIQUE
CHAPTER 2Prepared by : Mohamad Faiz Bin Jamaludin
Jabatan Kejuruteraan Elektrik
Politeknik Mukah, Sarawak
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WHAT IS SOLDERING
Soldering is a process in which two or
more metal items are joined together by
melting a filler metal into the joint, the filler
metal having a lower melting point than thework piece.
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SOLDERING TOOLS
There are 2 type of soldering tools:-
Soldering Iron
Soldering Gun
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SOLDERING IRON
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SOLDERING GUN
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WHAT IS DESOLDERING ?
Desoldering is removal of solder andcomponents from a circuit for
troubleshooting, for repair purposes, and for
component replacement.
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PRACTICE HAND SOLDERING
TECHNIQUE
Bad
Soldering
technique
Type of bad
soldering
technique
Good soldering
technique
Cool solder
Dry joint
Bubble
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GOOD SOLDERING TECHNIQUE
Place the soldering iron tip against
both the lead and the circuit board
foil. Heat both for 2 or 3 seconds.
Then apply solder to the other side
of the connection.
As the solder begins to melt, allow
it to flow around the connection.
Then remove the solder and the
iron and let the connection cool.
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STANDARD OPERATION PRACTICE
OF SOLDERING TECHNIQUE
Clean any raw p.c.b.
copper tracks gently
with an abrasive rubber
block.
Clean the soldering iron
tip using a damp
sponge.
Insert components and
splay the leads so that
the part is held in place.
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Melt a little solder on
the tip of the iron.
Touch the soldering
iron onto the joint to be
made. Make sure it
touches both thecomponent lead and
the track. Hold the tip
there for a few seconds
Feed a little solder onto
the joint.
Remove the solder, then
the iron, while keeping
the joint still
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BAD SOLDERING TECHNIQUE
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BAD SOLDERING
TECNIQUE
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TYPE OF BAD SOLDERING
a) Bad soldering of terminal
wire. The wire was not heated
enough and the solder did not
wet the top. This wire could
pull away from the joint.
b) Bad soldering of PCB
trace. The trace was not
heated enough to let the
solder wet and flow over
the surface of the trace.
c) Bad soldering of terminal
wire and PCB trace. This is
a cold solder joint where
the soldering iron was not
held on the joint long
enough to
heat the joint sufficiently.
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DESOLDERING TOOLS
There are 2 type of desoldering tools
:-
Solder Sucker
Solder wick
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SOLDER WICK
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DESOLDERING TECHNIQUE
The two solder joints to
be desoldered.
If using a sucker, apply
the soldering iron tip first
to melt the solder joint.
Sucker is applied to the
solder.