chapter 2 - soldering techniques.pdf

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.








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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

chapter 2 - soldering techniques.pdf

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