USER MANUAL
SOLDERABILITY TESTER
METRONELEC
V2.0
–
10/2021
6 Avenue Eiffel - 78420 Carrières-sur-Seine
Tél : 01 30 15 20 00
Web :
http://www.metronelec.com| Mail : [email protected]
Page
9
sur
83
Wetting force divided by perimeter
An alternative way between angle and force is to divide the wetting force by the perimeter
so we obtain a result independent from the perimeter.
Using the same notation, we have :
As
LV
is constant, this unit is just function of the wetting angle and limited by +
LV
as cos8
can’t be greater than one.
Solderability
Soldering
Soldering is the assembly of metallic surfaces with the help of a metal or an alloy in the
liquid state.
The liquidus temperature is below these of the metals to joint by wetting. These surfaces are
not reflowed during this process (by opposition to brazing) but are dissolved in the alloy.
Soldering is the main solution used in electronic assembly to provide a good electrical,
mechanical and thermal link with the following advantages:
•
Good knowledge of the technology
•
Wetting effect
•
Very long feed back
•
Low cost
•
Mass production is easy
•
Low temperature
All soldering methods use an alloy and a flux associated in different ways following the
application type:
•
Cored solder wire with solid flux
•
Wave soldering with liquid flux
•
Solder cream reflow with pasty flux