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Soldering
13 questions By Tony R. Kuphaldt
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Question 7 of 13
What is a cold solder joint? Identify its causes, its appearance, and the means of correction.
Reveal answerA “cold solder joint” is a poor solder connection resulting from motion of the pieces during the cooling process or insufficient temperature.
Notes:Ask your students where they obtained their information regarding the causes, appearance, and remedy for cold solder joints. There is a lot of information available on soldering, and it is always interesting and informative to discover new sources of information for future reference.
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Question 8 of 13
After a period of use, the tip of a soldering iron (or a soldering gun) becomes dark and “encrusted” with oxidation and flux residue. Describe why this accumulation impedes the soldering process, and how it may be removed.
Reveal answerAny oxidation or foreign material on the soldering tool tip will impede heat flow to the item being soldered. Routine cleaning is easy: just touch the hot tip to a water-soaked sponge or rag.
Notes:Discuss with your students why a wet sponge or rag works to clean the end of a heated soldering tool. Also, discuss what to do to the tip of a soldering tool that has been abused by lack of periodic cleaning.
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Question 9 of 13
What may be done if you solder a component into a circuit board and then realize you soldered it in the wrong place? What, exactly, must you do to move this component to a different location on the board?
Reveal answerYou must desolder the component from the board, using any number of desoldering tools:
- • De-soldering “wick”
- • De-soldering bulb
- • De-soldering “pump”
- • Vacuum station
Notes:Ask your students to describe how some common desoldering tools (wick, bulb, plunger, vacuum system) work, and also ask them where they obtained their information.
