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Complete Guide for PCB Assembly Process

Nowadays electronic components are becoming an inseparable part of our lives. They are widely applied in many industries, such as consumer electronics, home appliance, automotive, IOT, defense, aerospace, networking, etc. All these products have the essential parts, namely the printed circuit board, known as PCB and electronic components. The electronic circuit boards are easily recognizable. They are green chips covered in lines and copper parts. There are many circuit board components on the top of the pcb board, and these are the electronic components such as resistors, MCUs, capacitors, etc. The PCB Assembly is considered as one of the most important steps in the electronic manufacturing process. However, this process could be a great headache and it is very time-consuming. For example, company owners or engineers need to select a number of suppliers for printed circuit board, electronic components as well as printed circuit board assembly.     There is an easy approach to do this, that is to find an one stop-solution provider which can help your company to source all the electronic components that are required for your projects, and to fabricate the printed circuit board for your electronics and to provide the SMT service. But few companies in the market are capable to provide such service, and it is a challenge to find a reliable and trustworthy turnkey PCB Assembly solution provider in the market.     Although you may find the suitable provider, how can the engineers make sure that the solution provider is well qualified to produce their products? Well, normally the production capability can be judged from a variety of perspectives, such as the design capability, you may ask the providers to provide some of the works that they have done before for their customers, in addition, you may check what type of production equipment they have, and whether they have dfm software, etc. Besides, how to ensure that the suppliers can meet your variety of demands for different electronics projects? Actually Allchips can provide a great variety of solutions subjected to different demands including turnkey pcb assembly, partial turnkey pcb assembly and consigned assembly; turnkey pcb assembly refers to the whole service from printed circuit board fabrication, electronic components sourcing and SMT assembly; partial turkey pcb assembly refers to electronic components sourcing and pcb assembly service, or printed circuit board fabrication and pcb assembly service; while consigned service refers to the pcb assembly only.    What’s more, the delivery of pcb assembly is quite important. It is crucial to get quick-turn pcb assembly because it facilitates your product testing. In order to get a quick-turn pcb assembly, the solution providers need to be possessed with the capability to quickly and accurately identify whether there is any potential design or other issues with the documents provided by the engineers. In addition, the providers need to be able to have all the components for your projects in stock. Allchips has over 4,000 suppliers for electronic components and many components in stock, which ensures that we are able to deliver a quick-turn pcb assembly.Many visitors are curious about the printed circuit board assembly process. This page will give a detailed introduction about the printed circuit board assembly process. The pcb circuit board assembly process is divided into the following six steps: Step 1: Solder Paste Stenciling The first step of smt assembly process is applying the solder paste to the printed circuit board with stencil, which is for applying the solder paste only to the parts where the electronic components locate on the pcb board. After finishing this process, you will get soldering circuit boards. Note: All the solder pastes needs to be stored in the refrigerators.Step 2: Pick and Place the components After the circuit board are applied with solder paste, the next step is to place the electronic components on the soldering circuit boards and make sure each components sit at its corresponding place with the right direction. In this process, the machine will pick up all some small components such as resistors and place them on the pcb board. In addition, other machines will pick up the large components such as MCU and place them on the circuit board accordingly.Step 3: Reflow Soldering Although the components are placed on the printed circuit board at its right location, the components are not solidified or fastened on the printed circuit board. Therefore, the reflow soldering process is required to solidify the components, which is the process of getting the printed circuit boards with components on it going through a reflow oven. This reflow oven has a series of heaters with different temperatures.Step 4: Inspection and Quality Control After the electronic components are soldered or solidified on the printed circuit board during the reflow process, inspection is required to make sure that all the parts are solidified, at the same time, to ensure that all the components are placed in the right locations with right direction. There are several sections adopted for inspection and quality control:Section 1: Automatic Optical Inspection: we use machine to check the placement and locations of the componentsSection 2: Manual Checks: to ensure the soldering quality, the manual checks are requiredSection 3: X-ray Inspection: this type of inspection is more complex and accurate, which can identify some potential problems that cannot be found with other methods.Step 5: Through-hole Component Insertion  After the electronic components are solidified on the PCB board, some components will be plated through the hole if there are such components requirement for that PCB board. Normally the soldering process for the through-hole components is different from soldering paste, there are two types of through-hole components insertion:Manual Soldering: The through-hole components will be inserted into the PCB board manuallyWave Soldering: Wave soldering machine is utilized to solder the through-hole components.  Step 6: Final Inspection and Function Test After the whole process has been finished, a final inspection is required to make sure that all the components are right soldered with the right direction and at the right position. After this, the final step is to test the function of the printed circuit board to make sure that it can function properly before shipment. Yyfab  has a very strict quality control and inspection system to make sure that we will deliver the high quality products to our customers.The digitization of pcb assembly processThe digitization of pcb assembly process refers to the visible flow of the printed circuit board assembly process starting from ordering, manufacturing, shipping and delivery. As the top 5 electronic components supplier in China, we are able to provide one stop solution for visualized printed circuit board assembly service.  Once the order has been received, Yyfab engineers will have a dfm analysis to preview and check to prevent any potential production problems. When the order gets started, the whole process will be visible which allows users to be aware of the process of orders.In addition, Yyfab has a strict quality control system to ensure the production quality.  Yyfab will be your best choice for turnkey pcb assembly service with high quality and quick turnaround. Contact Us Now

August 19,2022
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