Distinguish circuit board quality is good or bad way

Over the years, with the rapid development of the electronic industry, the rapid rise of PCB circuit board industry, we are more and more high quality requirements for the circuit board, let kinhford Electronic Technology Co., Ltd. to introduce the two ways to distinguish the quality of the circuit board:

1, with the eyes to observe the appearance of the circuit board, such as thickness, size and so on whether meet the requirements, if not, it needs to be remade, with the board market competition is becoming more and more fierce, some manufacturers in order to save costs, the use of some low board, more or less there will be scratches and cracks, the performance of the board will have a certain impact. 23 (1) https://www.kingfordpcb.com/yuan.php?time=1685694568

2. First of all, it can be used normally after the installation of components, which requires the circuit board without short circuit and open circuit. The factory has an electrical testing process in production, which is to detect whether the board has short circuit. At the time of patch welding, it is necessary to check whether the pad falls off under the condition of high temperature, resulting in no welding. In addition, the high temperature resistance of the board is also very important. An important index of the board is the TG value. When making plates, engineers need to instruct the board factory to use the corresponding board according to the requirements of different service conditions.

When we choose the circuit board, the price is one of the factors that need to be considered, in addition to the quality of the circuit board and other aspects also need to be considered, only in this way to order the cost-effective circuit board. There is green oil in the element hole, resulting in poor tin plating in the hole. The green oil in the hole should be kept below 10 percent of the hole wall and the number of holes in the internal green oil should be below 5 percent. 2, leading to poor tin plating in the hole may be too small coating thickness. 3. The coating thickness on the component hole wall is not enough, resulting in poor tin plating in the hole. Generally, the thickness of the pore wall should be above 18 microns. 4. The hole wall is too rough, resulting in poor tinning or pseudo-welding in the hole. 5, the hole is wet, resulting in pseudo welding or bubbles. Packaging the PCB when it is not dry or cooled, and leaving it for a long time after unpacking, etc., will result in moisture in the hole.

6. The main factor leading to welding failure may be that the hole size is too small, the parts can not be inserted into the hole, or the positioning hole is offset, the parts can not be inserted into the hole.

The above is about "distinguish the quality of the circuit board is good or bad in 2 ways" introduction, I hope to have some help to you, more PCBA information please pay attention to the content of the site update! kinhford Electronic Technology Co., Ltd. is a professional PCBA processing enterprise, with fully automatic SMT production line and wave soldering, for you to open the whole production and quality testing process, find us, you belong to have your own electronic processing plant!