In the PCBA processing process, the welding process is a very important process. If there is slight negligence in the operation and the relevant process regulations are not followed, it will cause welding defects. Common welding defects include: false welding, false welding, continuous welding, cold welding, lack of tin, etc. Today, we will have a detailed understanding of what false welding is, as well as the causes and hazards of false welding!
False welding refers to the phenomenon of manual visual inspection during the PCBA welding process, which shows that the welding has been successful. However, sometimes it only needs to be lightly moved with a finger to separate the lead from the solder joint. In other words, even if it appears to be successful, the welding actually fails. This phenomenon is also commonly known as false welding; Because false soldering is difficult to distinguish with the naked eye, it is usually discovered during AOI testing. The main reasons for false soldering are problems with soldering iron heads, flux, component pins, and solder quality; When the amount of soldering flux is insufficient, the temperature of the Luo iron head is insufficient or too high, the pins of electronic components are oxidized, the soldering quality is poor, the soldering time is not controlled properly, and the furnace temperature is not suitable, etc., all of these situations can lead to the occurrence of false soldering;
In addition to the above reasons, solder paste printing problems can also lead to false soldering. However, SPI equipment is now used for testing after printing, so there are relatively few false soldering phenomena caused by solder paste problems at present; The harm of false welding lies in the fact that it can cause trouble in production and unnecessary rework and maintenance work, not only increasing the cost of PCBA production, but also reducing the production efficiency of PCBA; The second issue is that false soldering can seriously endanger the reliability and service life of products. If false soldering is not detected and applied to products, it may cause serious quality problems and safety hazards
