When the PCBA chip processing welding, what are we need to pay attention to?
I. Welding should pay attention to the following points
1. The general welding point of the entire welding operation time control in 2 ~ 3s.
2. The time between the various welding steps to stay to ensure that the welding quality is critical, need to be gradually mastered through practical operation.
3. after the completion of welding operations, in the solder paste has not completely solidified before, can not move to change the position of the welded parts.
II. Discrete components of the welding considerations
Discrete components of the welding in the whole electronic product is at the core. Welding in addition to mastering the soldering operation, but also need to pay attention to the following aspects of the problem:
1. The soldering iron should generally be selected endothermic (20 ~ 35W) or thermostatic, the temperature does not exceed 300 ℃. General selection of small conical iron head.
2. Heating should try to make the soldering iron head at the same time contact with the printed circuit board copper foil and component pins, the diameter of the pad is greater than 5mm pad can be rotated around the pad.
3. More than two layers of printed circuit board welding pad holes should also be moistened to fill.
4. after welding should be cut off the excess pins, and the use of cleaning fluid to clean the printed circuit board.
5. The most common electronic components on the printed circuit board resistors, capacitors, inductors, diodes, etc., these components of the SMT chip processing welding method is basically the same.
III. Integrated circuits mounting and welding precautions
IC insertion and welding methods and discrete components of the insertion and welding methods are generally the same, only the number of pins of the integrated circuit is relatively large, in the integrated circuit for insertion or welding, the need to be more careful. Generally different printed circuit board integrated circuits are inserted in different ways, in order to make the integrated circuits can be more good heat dissipation, the bottom of the integrated circuits installed in an integrated circuit socket, through the integrated circuit socket on the integrated circuits are fixed.
IC internal integration is high, subject to excessive heat is also easy to damage. It absolutely can not withstand temperatures higher than 200 degrees, so soldering must be very careful. In addition to mastering the basic essentials of tin soldering operation when welding, but also need to pay special attention to the following points.
1. Gold-plated circuit pins do not use a knife to scrape, just scrub with alcohol or use a drawing eraser can be clean.
2. Do not take off the CMOS circuit before welding the pre-set short circuit.
3. The welding time is as short as possible, generally no more than 3s.
4. The use of soldering iron is best to constant temperature 230 degrees soldering iron.
5. The best workbench to do anti-static treatment.
6. Choose a narrow tip of the soldering iron, welding will not touch the neighboring endpoints.
7. The pin safety welding order for the ground – output – - power supply – - input.
Zhejiang NeoDen Technology Co., LTD., founded in 2010, is a professional manufacturer specialized in SMT pick and place machine, reflow oven, stencil printing machine, SMT production line and other SMT Products. We have our own R & D team and own factory, taking advantage of our own rich experienced R&D, well trained production, won great reputation from the world wide customers.
In this decade, we independently developed NeoDen4, NeoDen IN6, NeoDen K1830, NeoDen FP2636 and other SMT products, which sold well all over the world. So far, we have sold more than 10,000pcs machines and exported them to over 130 countries around the world, establishing a good reputation in the market. In our global Ecosystem, we collaborate with our best partner to deliver a more closing sales service, high professional and efficient technical support.
Post time: Jan-16-2024