First, the setting of the operating temperature of the soldering iron tip:

The temperature of the iron head is 150℃ on the basis of the melting point temperature of the solder. The temperature of the iron head of the lead solder wire can generally be set as 330℃, and the setting temperature of the iron head of the lead-free solder wire is generally expected to be between 350 degrees and 370 degrees.

2. The correct sequence of manual soldering iron welding: the surface of the weldment should be treated before welding → the component leads or conductive welding parts to be soldered should be wetted with solder in advance, that is, tinning and tinning → attention should be paid to the appropriate amount of assistance during the welding process. Flux (for solid core solder wire), rosin type solder wire can be directly soldered without additional flux → keep the tip of the soldering iron clean when soldering by hand → specific soldering process (operated by trained and qualified solder operators) → soldering When the soldering iron head is withdrawn, place the soldering iron head on a soldering iron stand to prevent burns.

3. The specific method of manual soldering iron welding: the tip of the soldering iron first touches the pad, transfers the heat to the pad to increase the temperature of the pad, and then puts the solder wire on the pad. At this time, the temperature of the pad should be enough to melt the solder thus forming a connection. The molten solder has the characteristics of flowing in the direction of high temperature. When it touches the pad first, it will quickly flow to the part where the soldering iron tip contacts, which can ensure that the solder joints are evenly covered with solder. When the soldering iron is evacuated, it is necessary to pay attention to the handling of the soldering iron in time, and pay attention to the angle and direction of the evacuation to ensure that the soldered solder joints are full.