What is the circuit board assembly for business?

What is the circuit board assembly for business?
Circuit board assembly means assembling electronic components on a circuit board. PCBs are one of the mostly used circuit boards these days. A circuit board without assembly is of no use.
Almost every electronic devices whether it is your smartphone or TV set, whether it is your ac remote or an electric heater, every product relies on a PCB. You can easily recognize the PCB assembly just by viewing small green chips covered by lines and copper parts on it. Being constructed up from different materials, these PCBs are usually held together with epoxy and insulated solder mask that generally comes up in green color.
As per https://www.raypcb.com/ the components on PCB are usually solidly struck on. A PCB with properly mounted components is known as assembled PCB, and the process is known as PCB assembly.
Basic designing of PCB Assembly
PCB assembly usually starts up with the fundamental unit of PCB, i.e., base. Several layers of components and materials are being introduced into it to create a whole PCB assembly.
Substrate: Substrate is the base material of any circuit board that offers a level of rigidity to It.
Copper: Copper is being used in the PCB assembly in the form of a thin conductive layer on the functioning side to follow the current between the different components.
Solder mask: This layer usually lies just above the copper layer. The primary purpose of t the introduction of this layer into the circuit board is to insulate the copper traces. It prevents the follow of current to the unintentionally contacted materials and hence makes it safer to use. Moreover, it also helps in keeping the components attached to the board.
Silkscreen: Final layer of a circuit board is silkscreen that adds ups labels to the circuit in the form of different symbols and characteristics. It is the easiest way to understand the functioning of different parts of the circuit board assembly.
What do we need to have to create a circuit board assembly?
• Printed circuit board
• Electronic components
• Soldering material
• Soldering flux
• Soldering equipment

What are the different forms of primary PCB?
Primary PCB is generally of three types:
• Rigid PCB: It is one of the most common used PCB forms that offers rigidity to your circuit board assembly and let it stay fixed.
• Flexible PCB: It is a little bit flexible PCB that you can easily bend as per your requirement.
• Metalcore PCB: It is another rigid PCB form that you can use as a substitute for Rigid PCB as well. As it is being created from metal, it tends to spread more heat than others. It dissipates temperatures evenly and protects the more heat sensitive board components.
What are the different types of circuit board assembly technologies?
For creating a perfect circuit board assembly, two main types of mounting technologies are used.
Surface Mount Technology
Surface Mount Technology is the mounting technology that is usually being performed for SMD electronic components. The components of a circuit board are susceptible, and some are even tiny such as resistors, and diodes. These components generally don’t’ have any leads or legs to connect. They need to be mounted on the surface of the circuit board so that to run them smoothly. Every electronic component and equipment of the surface mount technology much differs from the other one.
Thru-Hole Technology
It is a mounting technology that is usually being performed with the electronic components with leads coming out. These components are generally being introduced through the tiny holes into the PCB for soldering process, and the extra lead part is being soldered out on the other end to create well functioning PCB assembly. The method of soldering is usually being done carefully to avoid the chances of having any misconnections. We generally use wave soldering or hand soldering to connect these components. On the successful completion of the soldering process, the circuit board assembly is being cleaned and tested out to find out a fault, or solder joint defect. If we found some errors, the entire circuit is being properly checked throughout and then rework will be done by hand on it.