How to avoid soldering defects in SMT assembly?

inSMTIn surface mount technology (SMT) processing75%to85%The defects are caused by solder paste defects, many details that are prone to problems, such as soldering defects. It can be said thatsmtThere are many causes of welding defects, so in the daily production detail control process,Solder pasteDefects are very troublesome. SoSMTHow can welding defects be avoided in surface mount technology (SMT) processing? Here, JJY solder Paste Manufacturer shares with you:

Also, because inPCBADuring processing, as there may be several thousand or tens of thousands of pieces in the same batch of products, the surface mount processing cycle is relatively long. Therefore, there may be dry solder paste on the template steel mesh, or the template holes and circuit boards may not be aligned properly. Such details may lead to problems at the bottom of the template or even atPCBADuring the processing of OEM materials, unnecessary solder paste is produced, resulting in poor soldering.

During the processing of printing on a fully automatic printing machine, the printing cycle is fixed in a specific mode. Make sure the template is located on the solder pad, which can ensure the cleanliness of the solder paste printing process. For fine templates, if damage occurs between the thin pins due to the bending of the template cross-section, it may lead to printing defects and short circuits.

SMTIn a turnkey project, the longer the operator waits after discovering a printing error after printing solder paste, the more difficult it is to remove the solder paste. When problems are found, the improperly printed boards should be immediately placed in the soaking solvent, as the solder paste is easy to remove before it dries.

To prevent solder paste and other contaminants from remaining on the surface of the circuit board, it can be wiped with a clean cloth. After soaking, scrub with a mild spray and dry with a hot air blower. If a horizontal template cleaner is used, the cleaning side should face down to allow the solder paste to fall off the board.

JJY is a well-established solder paste manufacturer with a history of fifteen years. For many years, it has been committed to the research and development and production of solder paste. The solder paste we produce is of stable quality, without solder connection, false soldering or monument erection. No residue, Wuxi beads, bright and full solder joints, firm solder joints, and excellent electrical conductivity. If you have any needs, please feel free to contact us.