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In the study, through researching the characteristic of the lead-free solder, we introduce the method of QFD (Quality Function Deployment) to transform the demand of production properties and process into the technical demand of the lead-free solder, thus we could transform the demand concept of sampling into a concrete performance index. Finally we can obtain two parameters of the technological competitive power index and market competitive power index to evaluate performance of the lead-free solder through making a series of experiments. We utilize the design of experiment method to find out key parameter of process and the best collocation of parameter, which make the co planarity of tin ball descend to 149 from 178 and promote the process's ability up to 95.2 from 85%.

The Lead-Free Solder Selection Method and Process Optimization Based on Design of Experiment