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8/10/2019 chapter 2 - Soldering Techniques.pdf
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CHAPTER 2
Jabatan Kejuruteraan Elektrik
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more metal items are joined together by meltinga filler metal into the oint the filler metal havin
a lower melting point than the work piece.
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DIFFERENCE BETWEENDIFFERENCE BETWEEN
SOLDERING AND WELDINGSOLDERING AND WELDING
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There are 2 t e of solderin tools :-
Solderin Iron
Soldering Gun
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Desoldering is the removal of solder and
components from a circuit for troubleshooting,for repair purposes, and for component
rep acemen .
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PRACTICE HAND SOLDERINGPRACTICE HAND SOLDERING
Good solderingtechnique
Soldering
technique
Type of bad Cool solder
so er ng tec n que
Bubble
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Place the soldering iron tip against
both the lead and the circuit boardfoil. Heat both for 2 or 3 seconds.
Then a l solder to the other side of
the connection.
As the solder begins to melt, allow it
to flow around the connection. Then
let the connection cool.
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STANDARD OPERATION PRACTICESTANDARD OPERATION PRACTICE
. . .
copper tracks gently withan abrasive rubber block.
tip using a damp sponge.
Insert components and
s la the leads so that the
part is held in place.
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Clean any raw p.c.b.
copper tracks gently with
an abrasive rubber block.
Clean any raw p.c.b.
copper tracks gently with
an abrasive rubber block.
Clean any raw p.c.b.
copper tracks gently with
an abrasive rubber block.
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a) Bad soldering of terminal wire.
The wire was not heated enough
b) Bad soldering of PCB trace.
The trace was not heated
c) Bad soldering of terminal
wire and PCB trace. This is a
cold solder oint where thean t e so er not wet t e
top. This wire could pull away
from the joint.
enoug to et t e so er wet
and flow over the surface of
the trace.
soldering iron was not held
on the joint long enough to
heat the joint sufficiently.
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ere are type o eso er ng too s :-
Solder Sucker
Solder wick
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SOLDER WICKSOLDER WICK
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The two solder joints to
be desoldered.
If usin a sucker, a l the
soldering iron tip first to
melt the solder joint.
Sucker is applied to the
solder.
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SOLDERING TECHNIQUE VIDEOSOLDERING TECHNIQUE VIDEO
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List 3 testin e ui ment and ive the
function of each equipment