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
7
sur
83
Figure 1: meniscus
The
projection of the forces upon the “z” axis is written:
The angle 8 directly linked to surface tensions is thus representative of the wetting quality.
The angle 8 becomes smaller when the wetting quality increases.
Note: The wetting angle 8 is conceivable only for alloys in the liquid state.
Balance measurement
As we dip the sample in molten alloy, we create an Archimedean push and a wetting force
then the sensor built in the balance sees these two different forces in the same time, hence
the following equation of the force measured by the balance :
Fr = Fw - Fa
Fr
➔
resultant force measured by the balance
Fw
➔
wetting force
Fa
➔
buoyancy (Archimedean push)
IMPORTANT
:
You have to consider the force and the
meniscus angle only when the meniscus
(the curve of the force) is stable.
Before, when the meniscus is moving (climbing)
the values of the force are uncertain.