Interpretation of the Basic Principle of Wetting Balance Testing and Relevant Standards Judgment
Wetting balance testing can quantitatively evaluate the solderability of electronic components and PCBs. More and more customers request laboratories to use this method to test the soldeability of samples. However,there are certain unreasonable aspects in the judgment of some testing standards related to wetting balance. Firstly,the basis for calculating the theoretical wetting force is introduced from a theoretical perspective combined with Young' s equation,and the physical meaning of the wetting curve is introduced in detail. Subsequently,the judgement requirements of several wetting balance test standards are summarized,the erroneous practice of neglecting the influence of non-wetting parts on the wetting force in the calculation process of theoretical wetting force in EIA/IPC/JEDEC J-STD-002E and IPC J-STD-003C-WAM1&2 standards,as well as the unreasonable aspect of using reference wetting force to evaluate the wettability of samples in the GJB 360B—2009 standard is pointed out,and correction suggestion is given. Finally,the unreasonable points of the related literature is proposed.
万方数据
维普
