PCBA Tech - Why should the through rate be emphasized in SMT chip processing?

Through rate has always been an important parameter in SMT patch processing. Through rate is the product from the beginning of the first process to the end of the last process, the main indicators are production quality, work quality, test quality, etc. The straight-through rate is a positively correlated ratio with the company's process capability. If the straight-through rate of an smt processing plant is very high, it also indirectly proves the company's quality and technical strength. This is why we have always emphasized the need to pay attention to straight-through rates internally.

In fact, the straight-through rate is more important as a direct reference between a company's profitability and customer satisfaction. The following SMT manufacturers will combine the relevant processes in the BGA rework to share the reasons why SMT patch processing emphasizes the straight-through rate.

For example: When BGA is soldered or reworked, there are two important changes in the process of collapse and deformation once or twice. Recognizing and understanding these two processes is very important to the successful soldering or rework of BGA!

It should also be recognized that the heating for rework belongs to local heating, which is different from the one-time welding that is generally performed with a reflow welding furnace.

(1) Melting process of solder joints: two collapses.

(2) Deformation process of the package: the upper bow of the first core part is warped.

The heating and cooling of the rework station is somewhat different from the reflow soldering furnace:

(1) For repairing equipment, since the hot air used for heating is jet air, the flow rate and air temperature are different at different parts. Generally, the core temperature is relatively low (tested with paper), and cooling is just the opposite, which is contrary to the requirements of the welding process.

(2) Rework heating or cooling is local heating, not balanced heating like reflow soldering heating. Regardless of PCB or components, the deformation is larger than that of reflow soldering furnace.

The above differences make BGA rework often appear edge or heart bridging phenomenon.

BGA welding is already very difficult, and it has to undergo rework, so the invisibly increasing production process also increases the possibility of abnormal quality.

Once there are quality problems in PCBA processing, the delivery time and customer satisfaction will be greatly reduced, which will have very serious consequences in the future development of the company.

Why choose PCBA factory for SMT processing?

1. Strength guarantee

▪ SMT workshop: It has imported placement machines and multiple optical inspection equipment, which can produce 4 million points per day. Each process is equipped with QC personnel, who can keep an eye on product quality.

▪ DIP production line: There are two wave soldering machines. Among them, there are more than ten old employees who have worked for more than three years. The workers are highly skilled and can weld all kinds of plug-in materials.

2. Quality assurance, high cost performance

▪ High-end equipment can paste precision shaped parts, BGA, QFN, 0201 materials. It can also be used as a model for mounting and placing bulk materials by hand.

▪ Both samples and large and small batches can be produced. Proofing starts at 800 yuan, and batches start at 0.008 yuan/point, and there is no start-up fee.

3. Rich experience in SMT and soldering of electronic products, stable delivery

▪ Accumulated services to thousands of PCB electronics companies, involving SMT chip processing services for various types of automotive equipment and industrial control motherboards. The products are often exported to Europe and the United States, and the quality can be affirmed by new and old customers.

▪ Delivery on time, normal 3-5 days after the materials are complete, and small batches can also be shipped on the same day.

4. Strong maintenance ability and perfect after-sales service

▪ The maintenance engineer has rich experience and can repair the defective products caused by all kinds of patch welding, and can ensure the connection rate of each circuit board.

▪ 24-hour customer service staff will respond at any time and solve your order problems as quickly as possible.