Phil,
Depending upon the size of the solder pot, in the long run, it might be cost effective to change out the solder rather than testing it. I am not sure how much the testing costs but look at the cost of testing versus the cost of material (recycling the solder from the pot and refilling the pot with a new batch of solder). You would have to establish a baseline for the amount of throughput/usage versus the contamination level in the pot to establish baseline data that would be used to justify how often to change out the solder in the pot. Either way you would have to keep a usage log.
Regards,
Thomas A. Carroll, CQA, CIT, FAA ODA Unit Member
Supplier Quality Engineer
Boeing Defense, Space and Security - East Region Supplier Quality
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian
Sent: Tuesday, September 06, 2011 9:47 PM
To: [log in to unmask]
Subject: Re: [TN] Solder bath purity testing questions
Phil,
Most solder suppliers will provide that service for people who continually
buy solder from them. I do not know if the service is free or not.
You cannot use XRF for this type of analysis. A good XRF spectrometer can
be precise, but it is just not sensitive enough for the low levels we are
talking about in J-STD-001. You really need an atomic absorption
spectrometer or some type of optical emission spectrometer (arc/spark,
inductively coupled plasma).
If your customers are going to audit you to J-STD-01, then the answer is
definitely "yes", with regards to your question about records. And for some
warranty purposes it might be good to have that data.
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Bavaro
Sent: Tuesday, September 06, 2011 7:11 PM
To: [log in to unmask]
Subject: [TN] Solder bath purity testing questions
I just installed a small selective solder rework system and now have to
start testing the solder bath for purity.
Who do you use for testing your solder bath for purity? I cannot seem
to find the old standby sources I had used in the past.
Do I have to keep the solder purity analysis going back to the same
company that I buy the bars from (alp___ to alp___, kes___ to kes___,
etc) or has this service been farmed out permanently to independent
labs? I am not able to find it quickly on the internet.
I thought about trying to use an XRF machine to perform my analysis
myself but I am a little skeptical about its' precision.
Lastly, I find that the words in J-STD-001 seem a bit excessive for my
situation:
"Records containing the results of all analyses and solder bath
usage (e.g., total time in use, amount of replacement solder, or
area throughput) shall be maintained for a minimum of one year for each
process/system."
Do I really need to record the time that we have the solder molten? I
can understand recording volume of solder introduced, but this is a
rework pot and the usage and throughput would be minimal.
Any help is appreciated.
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