SMT chip components placement welding precautions

SMT chip processing, there are many types of components, including chip components SMT assembly welding technology is the key to product quality and reliability are affected. Chip components are micro-electronic components, there are many types of models, different shapes, physical properties are not the same, in the placement welding need to pay attention to the following:

1, before welding, you need to know whether there are special requirements of components, such as welding temperature conditions, assembly methods. Some components can not be immersed in tin method, only soldering iron, such as chip potentiometer and aluminum electrolytic capacitors, so you need to select the right welding method according to the situation.

2, for the need to dip solder soldering components, it is best to only dip it again. Multiple immersion tin will cause PCB bending, cracking components.

3, the welding process, in order to prevent electrostatic damage components, the use of electric soldering iron and solder furnace, should have a good grounding device.

4, for the choice of PCB should be small thermal deformation, copper coated with a large force. Due to the narrow surface of the copper wire assembly, pad small, if the lack of anti-peeling ability, the pad easily peeling off, the general use of epoxy glass fiber substrate.

5, rectangular rectangular capacitor, the appearance of a larger, such as 1206 type, easy to weld, but due to uneven welding temperature, Shanghai chip processing prone to cracks and other thermal damage; the appearance of smaller, such as 0805 type, although the welding more difficult, but not prone to cracks and heat damage, high reliability.

6, PCB board if you need maintenance, components should be minimized the number of disassembly, because many disassembly will lead to PCB completely scrapped. In addition, mixed printed circuit boards, such as plug-in components that hinder the disassembly of chip components, can be removed first.

SMT chip processing for the welding of chip components is very complicated, the operator should learn to understand the welding techniques and their precautions, careful operation, to avoid errors, affecting the quality of welding.