Both ideas are potentially valid. It would be easy to trace the source 
by EDXing a sample of the raw solder in the machine, as well. I take it 
the Ti concentration is in the ppm/ppb range. Perhaps your question is 
really whether small quantities of Ti will affect the reliability of the 
solder joint? I think not.

On 13.06.2013 17:03, Amol Kane wrote:
> Dear Technetters,
> We are seeing some titanium residues (confirmed by EDX) on solder joints after wave soldering post wash (that is not to say they are not present post wave, more analysis is ongoing). Water soluble process, high lead alloy, and a saponified wash. So far the Ti residues are only detectable on the solder joints, not on the assy surface. For general information. what are some possible sources of Ti on the assembly?
>
> Regards,
> Amol
>
>
>
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