Electronic circuit board assembly-Andwin

The PCB Assembly Process:

Solder Paste:
If you’re following a traditional PCB assembly process, the first step is the application of solder paste.
Note that this is not the case with THT, but SMT does require paste application and/or printing.

Component Placement:
In the traditional PCB assembly process, the next step is to place the components on the board. This can be done manually, or it can be done with the assistance of machinery (pick and place systems).
In THT assembly, components are placed by hand, which requires incredible precision.
In the SMT process, robotic systems place components on the board. Note that automated placement is far faster than manual placement and is just as precise.

In the traditional PCB assembly process, the next step is reflow, which is when the solder is first melted and then resolidified.
The board and all its components move through an oven, which heats the solder, liquifying it and ensuring that connections are formed before the board moves into a cooler, where the solder is cooled.

Note that the THT process does not require reflowing solder. Instead, the second step here is to inspect the board and rectify component placement.
This is due to the manual placement process – a visual inspection in conjunction with a design transport frame helps ensure placement accuracy.

In the SMT process, reflow soldering takes place at this time, as well. The board is sent through a furnace, which melts the solder paste, allowing it to flow as necessary, before the board passes through a series of coolers that gradually bring the temperature down, solidifying the solder on the board and cementing the components in place.


The next step in the traditional PCB assembly process is a visual inspection of the board, soldering, and components.
Note that this step has already occurred in the THT and SMT processes.

Through-Hole Part Insertion:
The traditional process requires that through-hole insertion be done manually, after the reflow and inspection process.
Soldering is also often done manually, but it may be done using wave soldering.

Final Inspection and Cleaning:
The final step in the traditional PCB assembly process is a final inspection of the board, the solder points, and the components, and a cleaning to ensure that debris or excess solder is removed.

The Right PCB Assembly Process for You

While the SMT assembly process is faster and often more accurate than either the traditional PCB assembly process or the THT process, it is not always the best option. For instance,
if you only need a single prototype board assembled, the THT method might be the better choice. Each situation varies and there is no single solution that will always work for every need.

At Andwin Circuits, we understand that needs, budgets, and goals vary. We pride ourselves on offering exactly the solutions each client needs.
Whether you’re producing a single prototype for proof of concept needs or you’re ready to move into full production with thousands of units being produced, we can help.
Contact us today to schedule your consultation or to learn more about our services and capabilities.


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