Explanation

Also called leads. The outgoing Une of the electronic components is connected with the printed circuit board to form the functional parts of the whole machine. The reliability of the whole machine depends to a great extent on the reliability of the leads. The conductive material used for electronic components are different in mechanical properties, electrical properties, thermal properties, magnetic properties, corrosion resistance and solderability due to different base material composition, bond (coating) layer type, impurity content, thickness and production process. When selecting electronic components, the following conditions should be taken into consideration: ① the impact on electronic components itself, such as conductivity, contact resistance, migration of ions and molecules Chemical changes and electrochemical effects. ② The impact on the sealing performance of electronic components, such as the affinity with electronic component packaging materials, the coefficient of thermal expansion, and its sealing ability Whether it is suitable for the production process of electronic components, such as cleaning, drying, butt welding, flattening, riveting, painting, baking, electrical aging, traction and bending of mechanical equipment, whether it is suitable for high-speed continuous production, and whether it can withstand gas pollution. ④ Is it suitable for the working environment of the entire machine? Can it ensure that the entire machine does not malfunction as a result? ⑤ Whether it is suitable for high density group welding technology of the whole machine.

Classification