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As these PCBs are made with different layers of dielectric materials, checking the material for its reliability, thermal capability, chemistry with other materials, adhesion, and several other qualities is necessary.
The motherboard comes with the jack, while GPUs have gold fingers. With these, we can easily connect them with reliable performance, and this connection is not permanent, so that the GPUs can be pulled out easily. There are hundreds of other examples of gold fingers connecting two PCBs.
SMT assembly could be better itself. It also has flaws, but for the time it is the best for the technology used nowadays. SMT has both its pros and cons. In one place, it is cheap; on the contrary, it has compatibility issues, and you have to look for alternatives.
If you are going to use axial lead components to attach electronic components on the PCB, then this process consists of straight axial leads that would go through in a straight line with every end of the wire that would be attached to the components on the board.
The assembling quantity of PCBs depends on the market's requirements. The mounting of PCB components on bare boards in a handful of quantities like 250 or maybe even less is known as low-volume PCB assembly. On the contrary, if the PCB assembling quantity is 1000 or sometimes more than 1000, it would be called high-volume PCB assembly.
AOI is a single big platform to analyze end-to-end failures with failure analysis tools along with real-time monitoring of the devices that use PCB. It is one of the significant inspection systems that make PCB competitive worldwide.