Product Description
Welding is filled with molten metal to form the wetting and binding sites in between two metal parts metallurgical bonding.
Process:
Diffusion: the liquid metal above the diffusion in the base metal to form a contact angle
The dissolution of base metal
Base metals and metal compounds between the liquid solder (IMC)
What is the weldability
The ability to weld
Welding results from the material, production process, storage conditions and aging decisions.
The final welding is difficult to predict the effect of qualitative measurement needs
But we can accelerate the aging of the samples and measured the effect of
Surface tension
Thomas YOUNG and physicist Pierre-Simon LAPLACE found the so-called "surface tension" phenomenon, when the following substances:
Liquid - solid - volatile gas
Meanwhile contact
How to test solderability
Production test
Visual inspection (dip and look, edge dip test)
Wetting balance method
Diffusion
Formula
LV = flux / surface tension of dissolved tin (? 0.4 mN / mm)
p = sample perimeter (mm)
q = contact angle
g = acceleration due to gravity (9.81 m / s ²)
P = solder density (8 mg/mm3)
v = volume of the sample infiltration (mm3)
Wetting process
Wetting process
Wetting curve
Wetting Force
Wetting Force
Evaluation criteria-IPC
Wetting force measurement instrument MENISCO ST 60
Run automated and computer controlled humidity tester with tin or tin bath to measure components, PCB, and other welding-related elements, such as flux, metal, solder alloy (including lead).
Measured by wetting force and wetting angle said.
Quantitative Analysis of ST60
Quantified results:
? Wetting force (mN)
Wetting angle (°)
Wetting
F =? LV.cos?. c-g.?. v
LV = flux / surface tension of dissolved tin (? 0.4 mN / mm)
c = sample perimeter (mm)
q = contact angle
g = acceleration due to gravity (9.81 m / s ²)
P = solder density (8 mg/mm3)
v = volume of the sample infiltration (mm3)
Wetting angle q
Test
Wetting angle measurement
ST60 compatibility
Aging test
Since the decomposition of surface coating, will produce the growth of intermetallic compounds, the surface of organic matter also has limited storage life.
Weldability is a relative concept, so it is necessary to contact their change over time.
Just know that just the weldability of the factory is not enough ... ...
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