Jun 01, 2017 · 2.2. Solder joint preparation. In practical hand soldering, solder melts were cooled to ambient temperature in air. In this study, a flux-cored SAC305 solder wire was used for hand soldering, and the diameter of the solder wire is 1 e diameters of Cu pad and through-hole were 2 mm and 1 mm, and the diameter of Cu lead of the electronicponents was 0.5 mm.
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