After the solder paste soldering is completed, the edges are uneven, there are burrs or stains on the surface?

source： JJY Release Date： 2022-08-12

If you find that the edges of the solder paste are uneven, there are burrs or stains on the surface after the solder paste soldering is completed, don't worry. Here are the solutions,Now, let's have the solder paste manufacturer explain it to you

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 contamination

Reason1The bottom of the steel mesh is coated with solder paste

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.

Generally, to solve a problem, one must first analyze where the source of the problem lies and why there are burrs?It's possible.Solder pasteIf the viscosity is too low, it may also be caused by the overly rough wall of the steel mesh used for welding. At this time, it is better to first check whether the wall of the steel mesh is polished well, and then re-perform the welding operation. If you have any questions, please feel free to consult us.

edit： JJY

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