The quality requirements for solder joints of electronic products should include good electrical contact, firm mechanical bonding, and beautiful appearance. In the wave soldering machine industry, the key to ensuring the quality of solder joints is to avoid welding defects.

The virtual welding of the welding spot of the wave soldering machine is mainly caused by oxides and dirt on the surface of the metal to be welded. It makes the solder joint into a connection state with contact resistance, resulting in abnormal circuit operation, unevenness, and irregular increase in noise, which brings great hidden dangers to the debugging, use and maintenance of the circuit. In addition, there are some solder joints. When the circuit starts to work, they can maintain good contact for a long time, so it is not easy to find them. However, under the vibration of environmental conditions such as temperature and humidity, the contact surface gradually oxidizes, and the contact gradually becomes incomplete. The contact resistance of the faulty solder joint will cause local heating, and the increase in local temperature will make the situation of incomplete contact with the solder joint more and more serious, and eventually the solder joint will fall off and the circuit will not work properly at all. This process may sometimes take one to two years. Wave soldering virtual welding solution.

According to statistics, nearly half of wave soldering machine product failures are caused by poor welding. However, it is not easy to find defective solder joints from an electrical device with thousands of solder joints. Therefore, solder joint defects are a hidden danger of circuit reliability and must be strictly avoided. Pay special attention to manual welding operations.

In general, the main reasons for the poor soldering of wave soldering machines are: poor solder quality; poor solder reducibility or insufficient flux usage; joints are not cleaned in advance, the solder is not strong; the temperature of the soldering iron tip is too high or too low, and the surface has an oxide layer; The space is too long or too short, so the master is not good: for lead-free wave soldering machine, when the welding is not solidified, the welded parts are loose.