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HAND SOLDERING
TRAINING
1
By : ANANT PATIL

Contents
1. What is soldering?
2. Electronic Component
3. Flux
4. Solder Wire
5. Soldering Iron
6. Soldering Process
7. Precautions during Soldering
8. Inspection + Handling
2

1 What is soldering?
 Formation of “metal to metal” joint using solder.
 The joint is made by alloy formation of base metal and
solder.
 In soldering, there are four key elements: Iron, Solder,
Flux, And Component; they all are important.
 Flux cored solder wire is used for hand soldering
3

2.1 Electronic Component
Electronic components are basic electronic element or
electronic parts usually packaged in a discrete form with
two or more connecting leads or metallic pads.
There are main three types of Electronic components –
1. Active Component
2. Passive Component
3. Electromechanical
4

2.2 Classification of Parts
Active Component: Those devices or components which
required external source to their operation is called Active
Components.
For Example: Diode, Transistors, SCR etc…
Explanation and Example: As we know that Diode is an
Active Components. So it is required an External Source to
its operation. Because, If we connect a Diode in a Circuit
and then connect this circuit to the Supply voltage., then
Diode will not conduct the current Until the supply voltage
reach to 0.3(In case of Germanium) or 0.7V(In case of
Silicon)
5

2.2 Classification of Parts…
 Passive Components: Those devices or components
which do not required external source to their operation
is called Passive Components.
For Example: Resistor, Capacitor, Inductor etc…
Explanation and Example: Passive Components do not
require external source to their operation.
Like a Diode, Resistor does not require 0.3 0r 0.7 V. I.e.,
when we connect a resistor to the supply voltage, it starts
work automatically without using a specific voltage.
6

2.3 Difference between Active and
Passive Components
 Active Components:
Those devices or components which produce energy in
the form of Voltage or Current are called as Active
Components
 Passive Components:
Those devices or components which store or maintain
Energy in the form of Voltage or Current are known as
Passive Components
 In very Simple words;
Active Components: Energy Donor
Passive Components: Energy Acceptor
7

2.3 Active and Passive Component
8

2.4 Type of Packages
There are many different type of Surface Mount Packages.
Each time a new SM package is developed a new name is
created. These names are usually abbreviated by their
initials.
For Ex. The Quad Flat Pack is commonly known as the
QFP.
The word “Package” is refer to the component’s physical
shape or outline.
9

2.5 Component Identification & Size
10

2.6 Parts Dimension
11
Different Components with SMT Nomenclature

3 Flux Function
What does it do?
12
During soldering chemical reaction takes place. The flux removes all
the surface tarnish leaving clean metal underneath.

4.1 Solder Wire
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Solder is a fusible metal alloy used to create a permanent bond between
metal and workpieces.
You should be aware of following while choosing solder wire –
Lead (Pb) Content
Flux Content
Wire Size

4.2 Construction of Cored Solder
14

4.3 Variables in Cored Solder Wire
 Solder Alloy
 Most use Sn60/Pb40 or Sn62/Pb36/Ag2 or LEAD FREE
 Flux Type
 No-Clean RMA (Rosin Mildly Activated)
o Flux residue are safe to leave on PCB. They will not cause corrosion or
electrical breakdown of ckt during its lifetime.
 Flux %
 1, 2 or 3. Higher flux % makes soldering easier but can leave more
flux residue which can make solder joint look cosmetically ‘dirty’
 Wire Diameter
 Select the right one for the required job
 Reel Size
 Generally 500gm.
15

4.4 Type of Solder wire
There are two main types of solder:
 Lead-based solder
 Lead-free solder
*The main practical difference between the two is the melting temp.
Lead-based solder: It was made of a mixture of tin and lead. Usually a
60/40 (tin/lead) mix, that melts at around 180-190 degree C.
Because lead has some damaging effects to our health. The industry is
moving away from lead and towards lead-free solder.
Lead-free solder: It is solder without lead. Now it is recommended to
use lead-free solder (RoHS) because of the health hazards of lead.
It has a higher melting point, so it is bit harder to work with, but usually
not a problem.
16

4.5 Flux Content
Solder wires usually have a core inside the wire containing flux. Flux is
designed to improve electrical contact and mechanical strength in
solder joints.
There are mainly two types of flux cores –
 Acid core - Used for plumbing
 Rosin core - Used for electronics.
So use rosin core only, But there are four types of Rosin Flux –
 R – Rosin
 RMA – Rosin Mildly Activated (Preferably used)
 RA – Rosin Activated
 AC – Non-Rosin Activated
17

4.6 Wire Size
For basic electronics work, a solder wire between 0.711 mm to 1.63 mm
diameter is good enough. However, solder diameter is determined by the
gauge number.
 For restoring antique computers for the museum, and repairing
vintage circuits that have huge solder tags, normally gauge 16 used.
 For PDIP and through-hole packages that have a standard pin
spacing of 0.1-inch, gauges 18, 20, and 21 is preferred.
 For SMD components such as SOIC packages where the pin spacing
is much closer, then a fine tipped soldering iron with a 22 gauge
solder wire works well.
18

5.2 Variety in Soldering Iron
20

5.3 Construction of Tip
21
A tip is mainly made up of Copper
core, to ensure good heat transfer.
 Iron plating is done on copper
core to make it thermally
insulative (Heat should be
transferred in proper way)
 Nickel layer is plated after iron
to make non-wetting to keep
solder wicking away from the
tip.
 Chrome plating is done at last
as a protective layer.

5.4 Types of Solder Iron Tip
22
Bevel Tip: It can be used for solder jobs that require pre-
loading the iron with solder.
The large flat surface can hold more solder than most
other tips, and it’s helpful when soldering small-gauge
wires together or dragging solder across surface-mount
chips to solder multiple pins at once.
Chisel Tip: With its broad tip, the chisel tip helps to
evenly deliver heat to component leads and pads.
This tip is great for soldering wires, through-hole
components, large surface-mount components, and for
desoldering as well.

5.4 Types of Solder Iron Tip
23
Conical Tip:
Conical tips are usually used for precision electronics
work, though they’re also often used for general
soldering. The pointed tip helps deliver heat to small
areas, such as tiny surface-mount components.

6.1 Type of Soldering
There are mainly two type of soldering :
24

6.2 Type of Soldering Processes
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6.5 Melting and Diffusion
 Alloy is formed by melting and diffusion of metals
 Tin and Copper together makes alloy formation
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It takes certain amount of time to create the
perfect solder joint. Too slow process can
damage PCB/Component and too fast will
not create a ‘sound’ joint

6.7 Surface Mount Soldering
There is no change in process of ‘Through-hole soldering’ and ‘Surface
Mount Soldering’.
Difference between Through-hole And Surface Mount Soldering
30
PLAY PLAY

7.1 Precautions: Soldering Station
31

7.2 Correct Posture when soldering
32

7.3 Handling method for cored
solder wire during soldering
33

7.4 How to hold Soldering Iron
34

7.6 How to clean the soldering iron
36

7.7 Temperature when cleaning
37

7.8 Solder tip condition-1
38
This tip has soldered 1000 joints. The tinned area is still shiny and smooth.
There is no charged flux adhering to it. Only use the tinned area to heat up
Joint area. It helps the heat to be transferred quick/consistently. Using the
none Tinned area of the iron will cause soldering problems.

7.8 Solder tip condition-2
39
The tinned area is dull and inconsistent and there is lots of charred flux
adhering to it. The ability of this tip to transfer heat to the solder joint is
significantly impaired by its poor condition.

7.12 Solder Quantity & Surface
Condition-1
43

7.12 Solder Quantity & Surface
Condition-2
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7.13 Key points for heating
What is the appropriate temperature for soldering???
Joint area temperature = The M.P. of Solder Alloy + 40~50DegreeC
For Sn60% solder
Joint area temperature = 190DegreeC+40~50DegreeC
= 230~240DegreeC
However the iron will be set much hotter at 350-450DegreeC
Note: The hotter the iron faster the joint can be made providing
the heat transfer from it is good.
Must try to heat up both/all parts to be soldered at the same time
If it is difficult to do this then evaluate special solder iron tips
Heating up more than needed, will cause overheating defects
Note: Using a very hot iron will increase the risk of soldering
defects and component damage. Soldering is a balance of time
and temperature.
45

7.15 Movement before solder solidifies
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7.16 Considerations for good
soldering
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8.1 Inspection and Handling
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8.2 Different Types of Defects
51

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