chapter 2 - soldering technique

8/13/2019 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.

chapter 2 - soldering technique

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