How to solve the problems of burrs and stains after solder paste soldering?

After the solder paste soldering is completed, we may find that the edges of the solder paste are not smooth, and there are burrs or stains on the surface. What should we do when encountering such a problem? Below, the solder paste manufacturer will explain it to everyone:

First, let's analyze the root cause of this phenomenon:

1.PCBThe formation of the board after soldering is blurry: The edges of the solder paste are uneven and there are burrs on the surface

Reason1The viscosity of the solder paste is relatively low

Solution: Replace the solder paste and choose solder paste with appropriate viscosity

Reason2The walls of the steel mesh holes are rough

Solution: Use the steel mesh before acceptance100Use a magnifying glass with a power supply to inspect the polishing degree of the steel mesh hole walls

Reason3:PADThe coating on it is too thick and the hot air leveling is poor, resulting in unevenness.

Solution: RequirementPCBThe manufacturer has improved and adopted gold plating.OSPWait for the pad coating process.

Ii.PCBSurface stain

Reason1The bottom of the steel mesh is coated with solder paste

Solution: Increase the frequency of cleaning the bottom of the steel mesh

Reason2Printed incorrectlyPCBThe cleaning is not clean enough.

Solution: ReprintedPCBBe sure to clean it thoroughly

Note:PCBAfter cleaning, it should be blown through with an air gun because there are many invisible tin balls stuck to the naked eyePCBIn the crevice.

Do you know how to solve the problem of burrs and stains after solder paste soldering now? If you have any other questions, welcome to follow the online message of JJY Solder Paste Factory and interact with us!