Crown PSA-2 - Page 70

Fig. 7.2 Correct and Incorrect Solder
Application
Problem: Unsoldered wire.
Characteristics:
Cause:
an
crown
One of the main advantages of using solder to make
connections is that it is one of the few joining methods
responsive to visual examination. This permits 100%
inspection, while other methods require sampling and
lengthy electrical tests. With proper inspection of
materials used, soldering is the most reliable, time-
proved, and versatile form of electrical joining offering
the benefits of economy, dependability and speed.
A good solder joint will have the following recognizable
features:
a) Proper wetting - mixing of molecules to form a
singular, shiny bond of metal
b) Proper flow - feathering out of solder
c) Proper contour - outline of wire under solder
d) Proper fillet - solder filling in holes and crevices.
Because visual inspection is an important part of
recognizing a good solder joint, the following examples
have been provided to help with familiarization.
Properly assembled junction of wire, but without any solder.
Solder not applied.
Fig. 7.3 Unsoldered Wire
Remedy: Correct amount of solder applied properly.
7-3