Hi Phil,
That has usually has been my experience too, but there have been a few times
that I've had the analysis come back low on tin. Couldn't explain exactly
why other than previous to the low analysis we were generating a lot of
dross because we had the turbulent wave on all the time because of the
boards we were running.
I was also told one time that using Kleenox when dedrossing the pot may
contribute to low tin because you tended not to add as much virgin solder.
Don't know how true that is, but it goes along with what you're saying...
Yes, that would be good to know what kind of solder pot we're talking about.
Steve
-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Thursday, March 10, 2011 4:12 PM
To: TechNet E-Mail Forum; Steve Gregory
Subject: RE: [TN] Solder bath analysis. Sn63Pb37 alloy.
My experience was always that the make-up addition of Sn63Pb37 bars was
always enough to level out the bath analysis. I suppose we should ask
whether the bath in question is a static tinning pot, wavesolder pot, or
rework fountain.
Phil
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Thursday, March 10, 2011 12:58 PM
To: [log in to unmask]
Subject: Re: [TN] Solder bath analysis. Sn63Pb37 alloy.
Hi Juan!
Yep, the dross is mostly tin oxides. You will generate more, the more
turbulent the wave is. The few times that I've had a pot get low on tin, I
think it was because we were running a lot of boards with bottomside SMT and
we had the turbulent wave on a lot.
You are also right, just get some pure tin bars and add them in.
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Juan T. Marugán
Sent: Thursday, March 10, 2011 3:42 PM
To: [log in to unmask]
Subject: [TN] Solder bath analysis. Sn63Pb37 alloy.
I have a question about the variation of the tin content in the solder
alloy and I'm sure that somebody will explain it me.
Why the tin content decrease more than 1% from the nominal of the
Sn63Pb37 alloy? May it be by the dross...?
I suppose that it will be neccesary to add pure tin. Is it correct?
Thank you for your support. Kind regards.
Juan
Indra Sistemas SA
Spain
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