Hello, everyone, I am Shunhai Science and Technology Xiaobian. Today, I will mainly introduce and share the reasons for the "bad welding" of the wound patch inductor. The following contents are compiled by Shunhai Science and Technology Xiaobian, and the related contents are for reference.
The reason of "bad welding" of wound patch inductance is explained as follows
Reason 1: the inductance pad of the wire-wound patch is oxidized or has foreign matter
Analysis: Poor inductance welding of wire-wound patch, oxidation of inductance pad or foreign matter are common problems of poor inductance welding, which are not only the chip winding inductance, but also the common abnormal reasons of poor inductance welding of other types;
Reason 2: The inductance pad of the wire-wound patch has burrs
Analysis: There is a foot cutting operation in the wire-wound chip inductor process. In this process, if the cutter is not well maintained, it will easily lead to burrs on the inductor pad material. In this case, the inductor attachment will also be uneven, resulting in poor welding;
Reason 3: the winding patch inductance pad is not flat
Analysis: Under normal circumstances, the pads at both ends of the winding patch inductor should be completely attached to the solder paste of the printed circuit board, but if the winding patch inductor does not bend during the foot bending operation, one end of the winding patch inductor will warp, resulting in abnormal welding;
Reason 4: the groove of the inductor body of the wound patch is too deep
Analysis: There are two grooves in the body of the winding patch inductor, which are roughly the positions after the winding patch inductor is bent, but if the winding patch inductor groove is too deep, it is larger than the thickness of the winding patch inductor material. Then it may occur that although the inductor is flat on the PCB, the pad of the inductor is suspended and does not contact with the solder paste, resulting in poor soldering;
Reason 5: Problems in customer manufacturing process
Analysis: Poor inductance welding of wire-wound patch, not only the inductance itself has problems, but also due to customer process problems, such as low solder paste temperature and insufficient reflow soldering temperature;
