Lou,
As Tim,I am is HASL area,but the principle is the same,but in your case
possible contamination of the solder might be even quicker: in HASL the
incoming stuff is bare copper and in case of in-house HASL we know more or
less what is no the boards.In your case most of contamination is coming from
solder on the boards and this is not so predictable, since the in-coming
solder is melted in your wave and stay in.If you are soldering PCB with
alternative finishing ( ENIG,Silver etc) your situation might be even worst.
By the way,we are performing over here daily solder cleaning procedure and
the samples for solder composition are sent each 10 calendar days to the
supplier - free of charge as service.
Edward
Edward Szpruch
Eltek , Manager of Process Engineering
P.O.Box 159 ; 49101 Petah Tikva Israel
Tel ++972 3 9395050 , Fax ++972 3 9309581
e-mail [log in to unmask]
> -----Original Message-----
> From: Timothy Reeves [SMTP:[log in to unmask]]
> Sent: γ ιεμι 11 2001 19:17
> To: [log in to unmask]
> Subject: Re: [TN] Wave solder pot analysis
>
> Lou,
> I agree with you. I don't deal with wave soldering, but with HASL, and I
> know from experience that a LOT can happen to solder composition in a few
> months, much less six, and I would guess that that's probably just as true
> with wave solder. I would stick with what you're doing. Our solder
> supplier
> does the monthly analysis for us at no charge (I suppose it's included in
> the price of the solder). Yours should too.
> Tim Reeves
> ECD
>
> -----Original Message-----
> From: Lou Hart [mailto:[log in to unmask]]
> Sent: Wednesday, July 11, 2001 6:54 AM
> Subject: Wave solder pot analysis
>
>
> TechNetters, I'd appreciate comments on contaminant analysis of a wave
> solder pot. We had been sending a sample out for analysis (type "C" I
> think it is, by the mil spec) once per month. Now the solder supplier is
> telling me that once every six months is more than enough. I've been
> taking the contaminant data and plotting Q charts (for short-run SPC the
> modern way, as I've been mentioning in this forum) with the monthly data.
> What has been your practice and recommendation?
>
> At the moment, it is hard for me to feel comfortable with a twice-yearly
> analysis of what seems to me to be an important material in our
> manufacturing process. Lou Hart
>
> --------------------------------------------------------------------------
> -------
> Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
> To unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt delivery of Technet send the following message: SET
> Technet NOMAIL
> Search previous postings at: www.ipc.org > On-Line Resources & Databases >
> E-mail Archives
> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
> additional
> information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
> ext.5315
> --------------------------------------------------------------------------
> -------
---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------
|
