What are the causes of false soldering in SMT assembly?

False soldering isSMTThe most common drawback in surface mount technology (SMT) processing. Sometimes after welding, the front and back steel strips seem to be welded together, but in fact, they do not achieve the effect of being integrated as one. The strength of the joint surface is very low. On the production line, weld seams must go through various complex technological processes, especially in the high-temperature furnace zone and the high-pressure tension straightening zone. Therefore, the weld seams of virtual welding on the production line are prone to band breakage accidents, which have a significant impact on the normal operation of the production line.SMTWhat are the causes of false soldering in surface mount technology (SMT) processing? The following is JJYSolder paste manufacturerLet me share it with you all:

1,SMTThere are disadvantages in the pad planning of surface mount technology (SMT) processing. The existence of through holes on the pads is a major drawback in the planning of printed circuit boards. It should not be used unless it is definitely necessary. Through-holes will lead to solder loss and solder shortage. The pad spacing and area also need to be standardized and matched; otherwise, the planning should be corrected promptly.

2,SMTDuring surface mount technology (SMT) processing, there is an oxidation phenomenon on the printed circuit board, that is, the soldered board is not bright. If there is an oxide eraser, it can be used to remove the oxide layer and restore its bright luster. Printed circuit boards that get damp can be dried in a drying oven. The printed circuit board is contaminated by oil stains, sweat stains, etc. At this point, it should be cleaned with anhydrous ethanol.

3,SMTDuring surface mount technology (SMT) processing, for printed circuit boards printed with solder paste, the solder paste is scraped, reducing the amount of solder paste on the relevant pads and resulting in insufficient solder. It should be made up for in time. The filling method can be composed of glue dispensers or bamboo sticks.

4,SMTPoor quality, outdated, oxidation and deformation of surface mount technology (SMT) processing result in false soldering. This is the most common reason.

JJY is a well-established solder paste manufacturer with a history of fifteen years, always dedicated to the research and development as well as 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, full, firm solder joints with excellent electrical conductivity. If you have any needs, please feel free to contact us.