Sometimes when receiving users, I encounter some problems more or less. The most user consultation is about the speed of the version of the version. Whether the quality can be guaranteed. In fact, the speed of a PCB factory production line is mature enough. The speed will not affect the quality. Mainly the selection of raw materials and the control of the internal quality of the factory. At present, domestic plate arrangement levels are from high to low: Shengyi Jiantao and commonly used national discipline. Shengyi S141 (TG value 140) board, Jiantao and the national discipline TG value of 130. Ink is also the best ink of the Sun 2000 series. Of course, the precision board is mainly determined by the production machines of each factory.

There are also some users who do not understand the difference between PCB lead tin spray and lead -free tin spray, so let's first understand what is spraying tin: one of the most common form of pads on the surface of PCB is tin spray, spray spray, spray spray The standard of tin thickness is 20um in the industry, but tin spray is divided into lead and lead, and there are also differences:

1) From the perspective of lead -free surface words, that is, one is environmentally friendly, and one is not environmentally friendly. Lead -containing 37 lead content does not exceed 5. And lead is still harmful to the human body, and there is no harm without lead.

2) But from the appearance color: It can also be distinguished. The pad with lead spraying tin treatment is more bright. If the lead, the color is more darker. And lead spraying tin is better than the infiltration of lead -free tin spray, and the cost performance is relatively high. It is recommended to choose lead in terms of price.

3) In terms of performance, if there is a lead -melting point at about 183 degrees, then the temperature of the tin furnace needs to be controlled at 245 degrees to 260 degrees, and the peak temperature needs to be controlled at the two two. Hundred and fifty degrees, the return temperature is from 245 to 255 degrees. If the leading point is about 2.18 degrees, then the temperature of the tin tin furnace needs to be controlled at 280 degrees to three hundred hundreds. Sixty to 270 degrees. Lead will increase the activity of tin during welding. There are lead tin lines. It is easy to use in comparison of lead -free tin lines, and lead -free tin spray is higher than that of lead -spray tin melting points, and the welding point will be much stronger.