Common PCBA production adverse defect

PCBA manufacturing process involves a series of process, process complex, need to work closely with each working procedure, which link out of the question is easy to cause the PCBA board of welding defects.

PCBA production

Common bad PCBA manufacturing defects are:

Missing parts, less tin, tin ball, tin beads), even the tin (short circuit), virtual (empty welding) welding, the erection, etc

1, the lack of a

The location of this post install components on pcb prototype leakage.

2, less tin

Solder paste printing, because the blade steel pressure is too small and so is not suitable for factors are less easy to printing on the PCB solder tin, when welding the welding plate is oxidation and wave soldering improper adjustment also easy to cause little tin.

3, tin ball, tin beads)

Tin ball is also called the solder ball, solder ball is on PCB, components pin, due to poor solder paste printing, reflow soldering temperature curve Settings have water vapor are prone to solder ball and PCB.

4, the tin

Even tin also refers to the short circuit, is refers to between two pins there should be no solder connection place of the connection, cause a short circuit. Due to collapse of solder paste, solder paste during printing and poor wave soldering are easy to cause the solder defects.

5, virtual welding (false welding)

Welding is also called empty welding, welding, refers to the solder joints in only a small amount of solder connection, causing poor contact, unstable state in a make to break. Little tin solder paste printing, element to float higher factors are easy to generate virtual welding.

6, the erection

The erection is also called the tombstone, it is to point to one end of the element from the solder joints, causing become warped. During reflow soldering, due to the rapid heating, there is temperature difference on both ends of the component, one end of the solder to melt completely, on the other side also is in a state of to melt, then easy to become warped.

Due to the bad defect PCBA manufacturing process, is caused by many factors, in addition to the associated with the operation level of employees, also has a lot to do with equipment and accessories.