The Importance of Soldering Iron Welding Inspection
The inspection is to check the welding quality of the welded circuit. The solder joints should not have false welds, false welds, open circuits, short circuits, especially whether the pins of electrolytic capacitors, transistors and other polar components are welded correctly. The quality of welding can be judged by the color and gloss of the solder joints, the degree of diffusion, and the amount of solder. For good welding, the solder joints have a unique bright white luster, which can be seen at a glance based on experience; if the color and gloss of the solder are stained or the surface is uneven, it indicates poor welding.
The degree of diffusion of solder on the surface of the attachment can also determine the quality of the welding. In the graph shown in Figure 7, (a) represents an excellent welding state, which is a state between good and poor. It is the penetration Inadequate churro status. As for the amount of solder in the solder joint, you can refer to the standard graph of the amount of solder when welding wires on a printed circuit board as shown in Figure 8. (a) After soldering, the solder forms a slowly rising hillside shape. The exact position of the wire can be determined by looking at the surface, indicating that the amount of solder is appropriate. This is a case where the amount of solder is too much.
Excessive solder accumulation not only fails to achieve the intended purpose of increasing mechanical strength, but also risks the occurrence of virtual soldering and collision with nearby solder joints (short circuit). (c) is the case where the amount of solder is insufficient. In this case, it is not easy to see any defects in the initial stage of welding, but after a period of time, it may fall off due to vibration or shaking. For defective solder joints with problems, repair welding measures should be taken to ensure that the welding quality reaches a satisfactory level.
