Yes, and yes, we have helped some Class 3 suppliers qualify new fluxes
and new processes. And yes they did everything they could to avoid the
cost but it was, as you say, part of the cost of doing business at that
level. We have seen one compnany that qualified an M0 water soluble. But
they did have problems, which we believe were related to cleaning
failure.
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Kasprzak,
> Bill (sys) USX
> Sent: Wednesday, August 21, 2002 2:08 PM
> To: [log in to unmask]
> Subject: [TN] J-Std-001C Qualification
>
>
> 'netters:
>
> I have a general question for those folks out there who do
> J-Std-001C, class 3 work. We use fluxes that are stronger
> than the "allowed" L0 or L1 activity levels. Because of this
> I had to "qualify" our process per Appendix B of the
> J-Std-001C. This according to J-Std-001C, paragraph 4.2b. The
> cost of doing this test, including materials, labor and
> whatever is approximately $7000.
>
> Now I have a couple of questions...
>
> 1) If one of the solder pastes that you qualified is no
> longer available, do you have to do a re-qualification if the
> manufacturer of the paste suggests a new material? (This
> implies a material change)
>
> 2) If you swap out a spray fluxer for a foam fluxer or apply
> flux with a different method at the wavesolder machine, do
> you have to do a re-qualification? (This implies a process change)
>
> I suspect the answer to both questions is yes. With the
> number of possible changes within a soldering process, it
> seems inevitable that process qualification and
> re-qualification could happen on a regular basis due to
> circumstances beyond your control.
>
> So are the class 3 guys out there either doing regular
> qualification testing or are you all using L0 or L1 (no
> clean/Rosin) fluxes.
>
> Is there anyone out there who participated in the writing of
> this section who can shed some light on the thought process
> behind this section of the spec.
>
> Thanks to all respondents.
>
> Bill Kasprzak
> Moog Inc. Manufacturing Engineering, Electronics
>
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