Dragging tin is a kind of solder wire welding process. Its purpose is to ensure the reliability of welding and prevent false soldering. Operators who are engaged in solder wire welding operations must be very familiar with it. Let's talk about the tin dragging skills and precautions when soldering the solder wire:

Analysis of Solder Manufacturers - Skills of Quickly Dragging Soldering Components with Solder Wire

1. The temperature of the soldering iron used when soldering the solder wire is generally 350-370 when the tin is dragged. If the temperature is too high, it will be connected to the tin, so it is generally recommended to adjust the temperature properly, or use a constant temperature soldering iron to achieve.

2. The soldering iron tip cannot carry tin when soldering the solder wire. The pad must be full and bright before the tin is dragged. After the foot position is aligned, the cutter head can be dipped in rosin to drag the tin. Blend slowly and drag to drag the tin.

Analysis of Solder Manufacturers - Skills of Quickly Dragging Soldering Components with Solder Wire

3. The tin dragging speed cannot be too fast or too slow. It depends on the melting of tin and components. The operator must have a certain feel and experience in this operation. To achieve proficiency, summarize the method.

The following is the operation method of dragging tin when there are many components to be soldered on the chip and the board: First, drag the tin to face the chip to be soldered, and make the tinned pin on the right side of you (hold the soldering iron in your right hand). Then the left hand erects the whole printing plate, the upper end is inclined forward about 45-60 degrees (personal habits), and at the same time, the upper end of the printing plate is inclined to the left about 45 degrees. In this way, the solder legs that are full of tin is tilted back and to the left. Melt the solder with a soldering iron and drag it down evenly from top to bottom. No matter how many or dense the solder fillets are, except for the following three solder joints, the rest will be dragged clean at one time, and the rest can be dragged once or twice; if the last one or two solder joints are encountered When the point cannot be dragged neatly, add a little tin to the unclean place, stand up the printed board with the solder feet facing down, and quickly knock the printed board against the desktop after the solder has melted, and the excess solder will be knocked clean. The solder joints produced by the right and downward dragging methods are quite perfect.

4, the soldering iron tip has better tin absorption effect when the solder wire is dragged. If the tin absorption effect is not good, the tin cannot be taken away. If you pay attention to the speed, you can use a soldering iron tip and a tin suction wire to drag the excess solder on the chip pins. Pay attention to the control strength to prevent damage to the chip pins.

5. The quality of the solder wire is also the key to whether the solder wire is easy to drag. The solder wire with high tin content and high purity is relatively easy to drag the tin. When the customer buys the solder wire, the customer will be reminded whether to drag the tin. If you want to drag tin, it is recommended to use a good drag tin solder wire.

After many experiences of technicians, the most important thing is to have high-purity solder wire, soldering iron temperature, dragging speed when dragging tin, and flux (here we want to emphasize that the current used The solder wires are all rosin core solder wires, and those containing flux do not need to add additional flux), the amount of tin absorbed by the soldering iron tip, etc. It takes more practice to fully control the tin dragging technology, guidance from technicians, practice by yourself, and then summarize method, support the sense of handshake.