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The Basics of Printed Circuit Board Assembly(SMT)
Friday, November 1st, 2019

Printed circuit board assembly(SMT), also known as “stuffing” or “populating” the bare printed circuit board, is quite an intricate process which involves many different stages.  Best Technology’ in house printed circuit board assembly service makes ordering your turnkey printed circuit boards a hassle-free experience as you can count on the industry’s largest support team to help you control every step of the process.

Here are some of the basic elements involved in the printed circuit board assembly process:

Solder Paste â€“ Solder paste is a combination of flux, a chemical created to assist in the bonding and melting of the metal, and small fragments of metal (solder) so as to apply the electronic components to the printed circuit board. The paste is placed on the board in specific places along the board in exact amounts with the use of a Solder Stencil and a paste application machine, automatically.

Pick and Place Machine – This machine is essential in an automated printed circuit board assembly process.  The machine is programmed to automatically coordinate with complete accuracy the places to precisely mount each electronic component to be soldered to the printed circuit board. These machines are exact and quick.

Infrared Reflow â€“ After the precise bonding element (solder paste) is applied to the PCB, the board will be directed to the reflow oven to join the electronic components to the board by melting the solder paste. This “oven” is comprised of many heaters whose main function is to heat the board to a precise temperature and control the level of cooldown as the solder hardens. This process is crucial to the creation of properly functioning electronics. The printed circuit board will run through a series of testing to ensure no issues or short-circuiting nor misalignments have occurred.

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A Customer’s Visit in Our Surface Mount Technology Plant
Wednesday, April 3rd, 2019

Mike, one of our clients visited our company on April 2 and inspected our surface mount technology plant.

During the tour of the plant, Mike was impressed with the plant operation as all machinery and equipment in good order and the factory employees dedicated to their tasks and were hardworking. Mike complimented our company on both the efficiency of the plant and our hardworking employees.

During the visit, Mike asked about specific process of surface mount technology, as he was overwhelmed by the quantity and operation of the machinery and wished to understand the process better.

The supervisor in charge of the plant explained the entire process to Mike which included the painting with solder paste, the machinery layout and reflow soldering. What Mike thought was really impressive was the real AOT testing and could not help complimenting us on the process.

Mike said that Best Technology was well suited to provide his requirements and would support Best for this. He believed that Best Technology can create greater value to clients as a result of the efficiency of the SMT manufacturing process.

Quality has always been Bests core value, and we prefer to losing quantity rather than compromising quality, and we are dedicated to form reliable relationships with our clients. We are appreciative of Mike’s positive comments about our company and we will continually strive to meet our clients expectation.

To Learn more, please log on https://www.bestpcbs.com/ 

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Welcome Our Customer from India
Thursday, January 10th, 2019

On January 9, 2019, we had a visitor from India. Best Technology thanks for having such an excellent partner.

John talked a lot with our general manager Peter and the members of business development department. John brought the material of SMT for us and hope we can make SMT for him. He was satisfied with our company culture and signed his name on the company cultural wall after the meeting came to an end and we took a picture with the client in the office of Best Technology.

Signed the name on the wall

Signed the name on the wall

Took a picture in the office

Took a picture in the office

After that, in order to know more something about capability in manufacturing of us, a member of business development department–Tiffany accompanied John to visit our SMT and PCB factory. They got an exclusive factory tour of Best Technology’s factory.

John and Tiffany in SMT factory

John and Tiffany in SMT factory

John and Tiffany in the PCB factory

John and Tiffany in the PCB factory

The client was satisfied with our high-tech equipment during the visiting. As the professional vendor of printed circuit board and PCBA in China, we will always uphold the mission–to provide the most suitable products and the most satisfying service for customers.

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5 Benefits of Putting Nitrogen into Reflow Oven
Monday, January 7th, 2019

The reflow oven is one of the indispensable equipments in SMT. Putting the PCB with components goes through the reflow oven then the solder paste adhering on the printed circuit board will melt. After the solder paste getting cold, the components will adhere to the PCB stably.

Picture of reflow oven

Picture of reflow oven

After you have learned something about reflow oven, have you ever know how to make the reflow oven work better? Here are 3 benefits of putting nitrogen into reflow oven listed as following:

√ It is able to make the surface tension of solder paste get smaller which is good for the components adhering to the PCB more easily.

√ It can decrease the oxidization in a certain. Because the nitrogen is a kind of inert gas which is hard to produce chemical compound.

√ Reducing the rate of void. Because the rate of void decreases with oxidation.

√ Nowadays, some manufacturers also develop to put nitrogen in wave soldering oven. It is able to decrease the speed of oxidation of liquid tin in the bath. As the slag of tin will be formed when the liquid tin contacts with air. After that, the slag of tin will adhere on the printed circuit board. If it happens to the connect between two spots of tin, it will cause short circuit.

√ It can increase the rate of tin feeding of pin components and then they will combine with the printed circuit board firmly.

PCB with components

PCB with components

Best Technology, a professional PCB solution provider, is always dedicated to catch up with times. Our unique technology and high quality products will give you a competitive supply of printed circuit board and PCB assembly and make your wearable devices more excellent. To learn more, contact us at 0755-29091601 or check our website: https://www.bestpcbs.com

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The Application of AOI in Reflow Inspection
Monday, December 24th, 2018

Today, we continue to talk about AOI technology applied in the PCB manufacturing. The component mounting inspection is followed by the reflow inspection, if you would like to know more details, please click The Application of AOI in Component Mounting Inspection to know.

AOI can be divided into two types: preventing problem phase and finding problem phase. The inspections after solder paste printing and SMT belongs to preventing problem phase and the inspections followed by reflow soldering are finding problem phase.

In the back end inspection of reflow soldering, AOI technology is able to detect some problems as below:

√ whether the components are missed, deviated or skewed.

√ The defects of polarity.

√ Whether solder joints are correct.

√ Whether the solder paste is enough.

√ Whether there is short circuit in soldering etc..

The back end inspection of reflow soldering is the most prevailing choice for AOI now. Because all of the assembly errors can be found at this process, so that the quality of printed circuit boards are able to step forward to a higher level.

Best Technology is the premier expert in manufacture of PCB and PCBA. Our unique AOI testing technology and high quality products give you a competitive supply of printed circuit board and rigid-flex circuit board. To learn more, contact us at 0755-29091601 or check our website: https://www.bestpcbs.com/

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The Application of AOI in Component Mounting Inspection
Monday, December 17th, 2018

In the previous articles, we have talked about PCB inspection and solder paste printing inspection. To find more information of the details, please check: The Application of AOI in PCB Inspection and The Application of AOI in Solder Paste Printing Inspection.

The component mounting requires high precision of equipment and the common defects including forgetting to mount the component, mounting the component in a wrong way, polarity reversal etc.. AOI technology not only can find the defects above, but also can check the connection dense spacing and the solder paste on the pads of BGA component.

 

Since the component mounting is followed by the reflow soldering, the testing after component mounting is usually called front end inspection of reflow soldering. However, it is meaningless from the perspective of quality guarantee. Because the defects can not be found in the reflow oven. The solder tin is able to correct by itself after melting in the reflow oven, so the the mounting displacement and solder printing status can not be detected on the substrate after soldering. In fact, the front end inspection of reflow soldering is incredible significant for quality guarantee as that the component mounting of all parts can be inspected before reflow soldering.

The alarm will be sent out if the defects are found by AOI technology. After that, the visual inspection will be carried out by the operator. If miss some components at this stage, it can be corrected by tweezers. After the visual inspection operator repaired the same problem for many times, he will ask the person who charge the production equipment to reconfirm whether the setting of the machine is reasonable. The feedback information is very helpful to enhance the production quality and it can improve it in a very short time.

Best Technology is the premier expert in manufacture of PCB and PCBA. Our unique AOI testing technology and high quality products give you a competitive supply of printed circuit board and rigid-flex circuit board. To learn more, contact us at 0755-29091601 or check our website: https://www.bestpcbs.com/

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New Automatic Solder paste Printer Adopted in SMT & PCBA
Thursday, August 25th, 2016

Great news! We (Best Technology) had adopted a new Automatic Solder paste printer for SMT /PCBA since Aug 25th, 2016. We use “G5” which is No. 1 brand in domestic market, made by a Chinese company, the repeated position accuracy is +/-0.01mm, and printing accuracy is +/-0.025mm.

Everybody know the most important element which will affect the quality of SMT /PCBA is the solder past printing quality. Excellent solder paste printing is the base for excellent quality of final SMT /PCBA quality, esp. for the small components such as SMD Chips with small size as 0402, 0201, 01005; IC with small pitch package such QFN, LGA, BGA; Connector with 0.25mm, 0.3mm, 0.40mm pitch.

Here are some pictures of new Automatic Solder paste printer.

Auto Solder Paste Printer

Auto Solder Paste Printer

Auto Solder Paste Printer printing the board

Auto Solder Paste Printer printing the board

Auto Solder Paste Printer with PCB printing

Auto Solder Paste Printer with PCB printing

PCB with solder paste

PCB with solder paste

Welcome customers release more SMT /PCBA orders to us. To learn more about Automatic Solder paste printer, or our SMT /PCBA service, please contact us right now!

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Simple Solderability Test Experiment
Saturday, August 23rd, 2014

As is well known, solderability is very important for any type of printed circuit boards, we must do solderability test of each batch PCB we made. In this way we can inspect the weldability of the PCB before we go ahead the assembly process, much helpful for SMT.

In our circuit board manufacturing workshop, we have professional equipment to do that testing. But normally these equipment was expensive, and a lot of people want to know a simple and cheap way to do that solderability testing, so today we are doing a simple solderability test and show you all the steps.

1. Take a small solder pot, plug in the power, turn on the switch and heat the solder pot to a certain high temperature(about 8 minutes).
solder-pot
2. Put a tin bar to the solder pot, then you can see the tin bar is begin to melting, slowly into liquid tin, then more and more.

Tin Bar

Tin Bar

3. After few minutes, there will be enough melting liquid tin in the solder pot to do this test.

melting tin

melting-tin

4.Use a tweezers to pick up a PCB circuit, first clean the PCB with rubbing alcohol. Because the unclear surface or the oxidation of the PCB will affect the test result.Pick-up-the-PCBclean the PCB
5. This is the key step of this test, put the PCB into the solder pot, depth about 2 mm,time 4-5 seconds is ok. Then you can see the tin will go into the hole of the PCB.

Solderability Test 1

Solderability Test 1

Solderability Test 2

Solderability Test 2

6. Take out the PCB from the solder pot and put it into the cold water. After few seconds, you can see the experimental effect.

Test Results

Test Results

This solderability test is very simple and easy. We can see the results very soon. We, Best Technology did solderability of every batch PCB we made, and we also supply our customers with the solderability test report and the test samples.

Any comments about that, leave your message or write email to us. Best Technology, always to be your best partner of circuit boards in China!

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