Crown PSA-2 - Page 72

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crown
Problem: Disturbed joint.
Characteristics: Rough appearance with questionable adhesion.
Cause:
Fig. 7.7 Disturbed Joint
Movement of wire/joint during cool-off stage. Remedy:
Use of holding vice or similar tool to help
prevent movement.
Problem: Cold solder joint.
Characteristics: Joint with dull, frosty appearance;
often has poor adhesion as well as imperfect shaping.
Cause:
Fig. 7.8 Cold Solder Joint
Too much heat applied (flux is boiled off before Remedy:
oxide removal action takes place).
Correct matching of iron/tip to specific job.
Correct solder flux combination is also important.
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