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Soldering Quality

September 13, 2022
A A

As per the IPC-A-610D, a compliant solder joint must fill at least 75% of the free volume between the pin and the PCB hole and there must be less than 25% of air cavity. Figure 2.103 illustrates the soldering joint acceptability.

Fig. 2.103: Acceptable soldering joints

If the requirement for pick and place and solder paste application process are not complied with, then the quality might be affected and it might produce defects due to insufficient solder paste resulting from: a) incorrect solder paste calculation, b) improper PTH/pin volume or c) inappropriate screen printing machine settings. Figure 2.104 shows an example of insufficient solder paste.

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Fig. 2.104: Unacceptable soldering joints: poor solder joint

Defects may also be caused by an excess of solder paste as per Figure 2.105.

Fig. 2.105: Unacceptable soldering joints: solder paste excess

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Source: Wurth elektronik
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