2, flux, with 25% rosin dissolved in 75% alcohol (weight ratio) as a flux.
3, soldering machine to be tinned before use, the specific method is: the soldering iron is hot, to be just able to melt the solder, coated with flux, and then evenly coated with solder on the soldering iron head, so that the soldering iron head uniformly ate a layer of tin.
4, automated soldering equipment welding method, the pad and component pins with fine sandpaper grinding clean, coated with flux. With the soldering iron tip dipped in the appropriate amount of solder, contact the soldering point, to be soldered on the soldering point of all melted and submerged component lead head, the soldering iron head along the component pins gently lifted up to leave the soldering point.
5, soldering machine welding time should not be too long, otherwise it is easy to hot components, if necessary, tweezers can be used to clip the pin to help dissipate heat.
6, soldering machine solder joints should be sinusoidal peak shape, the surface should be bright and rounded, no tin splinter, the amount of tin is moderate.
7, soldering machine welding is completed, to use alcohol to the circuit board on the residual flux cleaning, in order to prevent the charring of the flux affects the normal operation of the circuit.
8, integrated circuits should be the last welding, soldering iron should be reliably grounded, or power off after the use of residual heat welding. Or use a special socket for integrated circuits, weld the socket and then insert the integrated circuit.
9, automated soldering equipment should be placed on the soldering iron rack.