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T7D09
What is the characteristic appearance of a cold tin-lead solder joint?
Pick an answer to check it.
Answer: C. A rough or lumpy surface
A cold solder joint happens when the joint does not get hot enough, and it looks rough or lumpy. A good tin-lead joint is smooth and shiny. Cold joints can make poor or unreliable connections.
Tip: Shiny = good; rough and lumpy = cold joint.