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1.�Situation:After 260 degree Celsius reflow three times,each time 10 second,pure tin electrolytic surface will have discoloration.why? do you have any suggestion to prevent this occurring?

2.��Situation:After reflow process , tin/lead surface will easily occur dewetting. What is the root cause of it?why?How do you start to investigate it? Do you have any suggesting to minimize this?

3.��How can you reduce whiskers appearing on the pure tin��electrolytic surface? what is the reason appearing whiskers?
Please state.

4.��During CVS analysis,the analysis results often show unstable and fluctuation.What is the problem here?��How can we solve this problem.Please state suggestion.

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