This is by far the longest of the videos at (20:44), but also packed with the most pertinent information. It provides great background on solder, flux, wetting, and then mechanics of the iron and the joint. We do not have the student handbook that is mentioned. We suspect that you can manage without that.
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Here are some key ideas that you should watch for:
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* What is solder?
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** What temperatures do the different solders melt at?
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* What is flux?
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* What is wetting?
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* What are the different aspects of a soldering iron?