Evaluation method of soldering and its unit

Abstract

Abstract PURPOSE: To perform wettability of soldering test with high accuracy through multi- dimensional evaluation, by immersing measured object in molten solder, measuring floating force, wetting force and wetting area ratio, and obtaining the value multiplying the measured value. CONSTITUTION: When the soldering bath 7 is moved and the measured object 5 is immersed in the molten solder 8, it is pushed up with surface tension at first and pushed down with wetting after that. The change in this force is detected with the differential transformer 6 and inputted to the memory circuit 13. Next, the soldering bath 7 is lowered, the measured object 5 is turned with the pulse motor 14, and the output signal of the optical detection set 20 is binarized 22 and fed to the operation circuit 25. The operation circuit 25 evaluates the wetting area ratio in multiple with the relative measurement for the entire wetting process in response to the production mode of the wetting curve to obtain overall evaluation including various factors, allowing to increase the accuracy of the wettability test for soldering. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Toshihiro Shima
• 👤 Yoichiro Maehara
• 👤 Mitsuo Shirata
• 👤 Akira Suzuki

Bibliographic Details