Assembled Resistors. Incomplete wetting

Assembled Resistors. Incomplete wetting

Cross-sectioned resistors were metallographic prepared in ALTER TECHNOLOGY Materials & Processes Laboratory, recognized as a recommended facility for such activity by ESA authority (MEMO ESA-TECMSP-MO-013165).

Sample & Method

Resistors assembled to a PCB have been submitted to the ECSS verification program. Metallographic analysis allows us to check the status of such devices after performing the environmental tests (Vibration & Thermal Cycling).


Microsectioning inspection of the resistor joints showed incomplete wetting in one of the contacts. In this case, the solder may not flow freely all the way to the end of the contact. The solder which is present on the contact is probably coming from the pretinning of the device.

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MC Lopez