在进行超声波探伤时,我们曾遇到这样的情况,一些使用过一段时间的探头和未使用过的新探头不能正常工作。从修理探头的实践中,认为探头不能正常工作的原因是: 1.晶片引线焊点的脱落; 2.芯盖引线焊点的虚焊、脱焊; 3.晶片和保护膜间因粘接不好而引起的空隙; 4.晶片的老化。 We have encountered the situation when performing ultrasonic flaw detection. Some probes that have been used for a long time and new probes that have not been used yet do not work properly. From the practice of repairing the probe, the reason that the probe can not work normally is that: 1. the lead of the chip lead falls off; 2. the lead-free solder of the core cap is soldered and de-soldered; 3. the bond between the chip and the protective film is not bonded Good and caused the gap; 4. Aging of the wafers.