​Rosin for PCB welding is very helpful. Welding head or element surface oxidation, this layer of oxide film to prevent liquid solder wetting effect of metal, not easy on the tin and welding, after touching rosin with soldering iron can quickly remove oxidation, make element is easy to weld. Solder joint will be some beautiful, with solder paste solder joint will be black.

Electronic components rosin usage after the tin soldering iron heating on the temperature, with deng xiaoping first file file to welding head of surface oxide layer, when the file to see the surface of the welding head appear bright red copper surface, dip in the welding head some rosin, can give on the soldering iron head solder.

Electronic components are generally good tin, if rust to bright, on rosin with soldering iron, tin again. On the circuit board was scraping the light can be directly with has tin element with rosin core solder wire welding. After rosin volatilize away before soldering iron, if to solder sticky point with rosin, don't move block before solder solidification.

1, add the amount of solder paste around two-thirds Yu Gangban, try to keep to no more than 1 tank volume Yu Gangban.

2, depending on the production speed, with repeated small amount of solder paste on the way of adding up the steel plate, in order to maintain the quality of the solder paste.

3, the day after the solder paste for use, and have not yet used solder paste is common place, should be also stored in another container. Solder paste after opening proposal out within 24 hours at room temperature.

4, the next day when using, should first use the new kaifeng solder paste, and will not use up the day before the new solder paste and solder paste in a ratio of 1:2, mixing and add in the form of a small amount of multiple use.

After 5, the solder paste printing substrate, suggested to place parts into 4 to 6 hours back to the oven to complete the dress.

6, more than 1 hour in line, please will solder paste before the line change from sheet metal income solder paste tank block.

7, solder paste printing after 24 hours in a row, such as dust pollution, in order to ensure product quality, in accordance with the method of step 4, please.

8, in order to ensure the printing quality advice every 4 hours will steel double opening in artificial way to wipe.

9, please control indoor temperature and 22 to 28 ℃, humidity RH30-60% for the best working environment.

10, to wipe the printing error of substrate, recommend the use of ethanol, IPA or scouring oil.

Welding circuit board is best with rosin welding, because rosin flux. But not too much, just a little bit, beginners will grasp the bad discretion of maintenance, often a soldering, solder point not big, also cannot too small, see of solder joints on printed circuit boards.

Now is machine welding board, individual using artificial repair welding, repair welding is current larger voltage is higher. Please look at the old electronic products or old black and white TV set with manual welding. Don't look good, but strong.