Cured Solder Adhesion Metric
Mechanical shear force defines the connection integrity within electronic assemblies. This csam evaluates the bond strength between the metal alloy and the printed circuit board pad after the thermal reflow process. It functions by measuring the load required to displace a component from its solder joint.
Engineers use this gauge to verify that the metallurgical interface withstands operational vibration and physical shock.
Shear Force Protocol
Technicians execute this test by placing a hardened steel probe against the side of a soldered component. The apparatus pushes at a consistent velocity until the joint ruptures. Data from this displacement provides the peak force value expressed in grams or kilograms.
Variations in alloy composition or inconsistent thermal profiles generate fluctuations in these results. Improper land pattern design or contaminated finish surfaces limit the maximum achievable resistance.
Failure Mode Analysis
Fractures occurring inside the solder bulk indicate a ductile transition and generally signal acceptable material performance. Separations occurring precisely at the interface between the copper pad and the intermetallic layer suggest a deficiency in the wetting process or surface preparation. Brittle failures along this junction pose significant risks during field deployment.
Low shear results highlight inconsistencies in the soldering temperature or surface oxidation during the manufacturing cycle. Periodic monitoring of these values maintains the reliability of high density interconnections.
