Soldering iron soldering posture and hygiene
Solder heating volatile chemical substances are harmful to the human body, if the operation of the nose is too close to the iron head, it is easy to inhale the harmful gases. General soldering iron away from the nose distance should be at least not less than 30cm, usually 40cm is appropriate.
There are three ways to hold the soldering iron, as shown in Fig. 1. Reverse grip method is stable, long time operation should not be fatigue, suitable for high power soldering iron operation. Positive grip method is suitable for medium power soldering iron or with elbow soldering iron operation. Generally in the operating table welding printed circuit boards and other soldering parts are used when holding the pen method.
How to solder chip components
Chip components because of its size is particularly small, so it is difficult to use a soldering iron according to the ordinary components as a hundred welding. And need to use special solder paste for welding. Amateur conditions welding chip components can be purchased on the market chip solder paste, now common on the market there are two kinds, one has been adjusted to the solder paste, trademarked as the God welding, the other is made of solder paste and blending agent blending and into the solder paste, trademarked as the big eye brand.
Welding method is: the patch components on the pad, and then in the component pins and pads in contact with the smear on the patch solder paste (pay attention to smear not too much in case of short-circuit), and then 20W endothermic soldering iron to the pad and patch components connected to the heating (the temperature should be 220 ~ 230 ℃), see the solder melting can be taken away from the soldering iron, to be soldered to solidify the soldering will be completed. After welding can be used tweezers clamp a clip is welded patch components to see if there is no looseness, no looseness (should be very strong) that is, said welding is good, if there is looseness should be re-wiped point patch solder paste to re-weld according to the above method.
