In the production of PCBA, the welding process is a very important step, and a slight lack of attention during the welding process may lead to poor welding. Among them, poor welding is a common and even an inevitable phenomenon in PCBA welding. Below, let's have a detailed understanding of what is poor welding, as well as the causes and hazards of poor welding!
The phenomenon of poor contact caused by inadequate welding process or operator negligence during welding, which results in a small amount of tin at the solder joints of the board, resulting in incomplete welding and contact, is called poor contact; The causes of false welding are similar to those of false welding, mainly due to: firstly, abnormal welding time, failure to grasp the welding time, resulting in too short or too long welding time; Secondly, the issue with soldering flux may be due to insufficient usage of soldering flux or poor reducibility; Thirdly, the temperature of the soldering iron head is abnormal, with temperatures too high or too low. In addition, issues such as oxidation of electronic components' pins and poor solder paste quality can lead to the occurrence of false soldering during the welding process;
Similar to fake welding, the problem of fake welding is also difficult to distinguish with the naked eye, and it is difficult to detect the phenomenon of fake welding through manual visual inspection; Even though there are two types of inspection equipment, SPI and AOI, during the welding process, it is still impossible to guarantee 100% that welding defects will not flow into the next process. Once the faulty solder motherboard is applied to the product, it will lead to frequent circuit abnormalities and interruptions, which will seriously affect the product's user experience;
In addition, some solder joints may remain in good contact for a short period of time without any abnormalities. However, when used for a long time, it will accelerate the deterioration of poor solder joints, ultimately leading to complete detachment between component pins and solder joints, completely blocking the product circuit and causing product scrapping. The consequences are very serious. Therefore, in order to avoid the occurrence of solder joints, during the PCBA welding process, Especially when manual welding, we need to pay extra attention!
