Welding is SMT chip processing process is indispensable link, if in this a link presented mistakes will directly affect the chip processing circuit board failed and even scrapped, so in the welding need to grasp the correct welding method, understand the relevant matters of attention to avoid problems.
1. in the chip processing before welding on the pads coated with flux, using a soldering iron to deal with once, to avoid the pads are poorly tinned or oxidized, the formation of bad welding, the chip is generally do not need to deal with.
2. Use tweezers to carefully put the PQFP chip on the PCB board, pay attention not to damage the pins. Align it with the pads and make sure the chip is placed in the correct direction. Set the temperature of the soldering iron to over 300 degrees Celsius, dip the tip of the iron into a small amount of solder, press down on the chip with the tool that has been aligned to the position, add a small amount of solder to the two diagonally positioned pins, still press down on the chip and solder the two diagonally positioned pins so that the chip is fixed and cannot move. After soldering the diagonal, check the position of the chip from the beginning to see if it is aligned. If necessary, adjust or remove and align the position on the PCB from scratch.
3. Start welding all the pins, you should add solder to the tip of the soldering iron, all the pins will be coated with solder so that the pins adhere to the wet. Touch the end of each pin of the chip with the tip of the soldering iron until you see the solder flowing into the pins. When soldering, stick to the tip of the soldering iron and the soldered pins in parallel to avoid overlap due to excessive solder.
4. After soldering all the pins, wet all the pins with solder in order to clean the solder. Z after using tweezers to check whether there is false solder, check the completion, from the circuit board coated with flux, will be relatively easy to SMD resistive components solder some, you can first in a solder point on the tin, and then put on one end of the component, with tweezers to hold the component, solder on one end, and then see if it is put right; if it has been put right, then solder on the other If it is, solder the other end. A lot of practice is needed to really grasp soldering skills.
Features of NeoDen IN12C reflow oven
1. Built-in welding fume filtration system, effective filtration of harmful gases, beautiful appearance and environmental protection, more in line with the use of high-end environment.
2. The control system has the characteristics of high integration, timely response, low failure rate, easy maintenance, etc.
3. The use of high-performance aluminum alloy heating plate instead of heating tube, both energy-saving and efficient, compared with similar reflow ovens on the market, the lateral temperature deviation is significantly reduced.
4. The heat insulation protection design, the shell temperature can be effectively controlled.
5. Intelligent control, high-sensitivity temperature sensor, effective temperature stabilization.
6. Custom-developed track drive motor according to the characteristics of the B-type mesh belt, to ensure uniform speed and long life.
Post time: Dec-13-2022