Usually we in the electronic city or on the Internet to buy some of the tin wire, go back to their own welding, more or less there will be a variety of problems, may be smoke, welding, even tin false welding and a series of problems, then we will answer these questions one by one for you!

First of all, let's talk about the situation of false welding, which can be roughly divided into the following points:

1. Poor solder quality;

2. Poor reducibility or insufficient amount of flux;

3. The temperature of the iron head is too high or too low, and there is an oxide layer on the surface;

4. The surface of the welding place is not cleaned in advance, and the tin plating is not fast;

5. When the solder is not solidified in welding, the welding element is loose;

6, welding time is too long or too short, not good grasp;

7. Component pin oxidation.

Having said these problems above, how do we solve the method of false welding?

1. Distribute the thimble properly and evenly, so that the amount of tin printed is even. At the same time, confirm whether the printing scraper blade is deformed and worn, and replace the bad scraper blade;

2, using point-by-point calibration method, calibration component mounting position, so that it is installed in the middle of the copper foil;

3, the terminal deformation needs to be reshaped and then mounted, for the dense IC deformation can not be installed components generally use a soldering iron hand. The oxidized components of incoming materials shall contact IQC and ask the supplier to improve;

4, appropriately increase the temperature and time of reflux preheating zone, so that it is fully fused;

5. Strictly control the time from printing to reflux, and try to adopt integrated production to reduce the long-term direct contact with air of the solder paste after printing;

6. Replace expired solder paste, strictly control the validity period of solder paste and first-in, first-out management.