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lead free selective soldering

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Doug

#37550

lead free selective soldering | 2 November, 2005

I am doing lead free testing on a Vitronics selective machine with a 4 mm nozzle. The finishes I am testing are ENIG, ImSn, and ImAg. The problem I am encountering is achieving good top side wetting. Has anyone had any luck with this type of an application yet? Any help would be much appreciated.

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#37551

lead free selective soldering | 2 November, 2005

I should specify that I am using SAC 305 as well.

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#37556

lead free selective soldering | 2 November, 2005

It could be lack of preheat or flux. You can verify the flux by hand applying. I'll bet it's lack of preheat though. That's usually the case with selective solder.

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#37593

lead free selective soldering | 3 November, 2005

Check flux penetration and type of flux. How much is solid contents. The solder filling is better under Nitrogen. Check the time (speed) of the nozzle whether is correct. Usually For SAC305 the temperature of bath is 320C/degrees, but only for selective soldering. Of course depends on the machine. Check for correct x,y,z co-ordinate (correct position solder joint vs. nozzle.)

I hope this help

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