Precautions for manual welding

For the connection method, the pad and the pin of the component are polished with fine sandpaper and coated with flux. Use the soldering iron head to dip an appropriate amount of solder and contact the solder joint. After all the solder on the solder joint is melted and immersed into the component lead, the electric iron head is gently lifted up along the pin of the component and leaves the solder joint.

1, the selection of appropriate solder, low melting point solder wire should be selected for welding electronic components.
2. Flux, with 25% rosin dissolved in 75% alcohol (weight ratio) as flux.
3, the electric iron before the use of tin, the specific method is: the electric iron is hot, to be able to melt the solder, coated with flux, and then evenly coated with solder on the iron head, so that the iron head evenly eat a layer of tin.
4. Welding method: Polish the pin of the pad and components with fine sandpaper and apply flux. Use the soldering iron head to dip an appropriate amount of solder and contact the solder joint. After all the solder on the solder joint is melted and immersed into the component lead, the electric iron head is gently lifted up along the pin of the component and leaves the solder joint.
5. The welding time should not be too long, otherwise it is easy to burn the components. If necessary, tweezers can be used to clamp the pins to help heat dissipation.
6, the solder joint should be a sine wave peak shape, the surface should be bright and smooth, Wuxi thorn, tin amount is moderate.
7. After welding, the residual flux on the circuit board should be cleaned with alcohol to prevent the flux after carbonization from affecting the normal operation of the circuit.
8, integrated circuit should be finally welded, electric iron to be reliably grounded, or after power use of waste heat welding. Or use a special integrated circuit socket, solder the socket and then plug the integrated circuit into it.
9. The electric iron should be placed on the rack of the iron.

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Use of flux

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Surface mount welding usually requires a small diameter tin wire, typically in the range of 0.50 to 0.75mm.

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Often, operators use too much flux. I'd rather use flux pens because they limit the amount of flux used.

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