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-----Nonwet/ de-wet problem in soldering lead frames
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I am having problem with solderability, non wet and de-wet. The lead frame material was alloy 42. I am new in this process and trying to figure out what is the cause of de-wet or nonwet.
Below are the process :-
- lead frame was subject to high temp 435 deg C
- pre-clean and 100% tin plated ( rack)
- subject to oven burn-in at 150 deg for 84 hours.
- hot solder dip - this is where I have problem.
* Need advise on what is the possible root cause.
* What do I need to look for ?
* What sort of test that I need to do ?.<?P>
- Singapore
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