Gary:
Could it be that the replenish solder is not of the proper
composition? Just a question. Perhaps a bad batch.
Regards,
Ramon
> -----Original Message-----
> From: Gary Camac [SMTP:[log in to unmask]]
> Sent: Thursday, December 04, 2003 5:14 PM
> To: [log in to unmask]
> Subject: Re: [TN] SnPb Solder pot composition
>
> I would usually agree with Ed's statement on tin content dropping. I have
many years of Kester Solder Analysis Reports, option C, that support that
statement. But, for the
> last four months my tin content has ran 63.16, 63.42, 63.24, and 63.4. No
pure tin was added during this period, only virgin solder. Sure has got me
scratching my head.
>
> Gary Camac
>
> Ed Popielarski wrote:
>
> > Yordan,
> >
> > Deviation from 63/37 can cause increased solder shorts in a wave
soldering
> > machine. At 63/37 (eutectic) the melt point is minimum, and there is no
> > plasticus range. As you drift from there the melt point increases and
the
> > plastic range increases. This is why hand solder is preferred at
60/40...
> > there IS plastic range and makes it easier to judge the joint as you
solder.
> > This is also the main cause of "frosty" joints (I hate to say "cold"
since
> > it is a very inaccurate term).
> >
> > Another thought to add to the mix is the accuracy of the lab. I
recommend
> > using either Alpha Metals or Kester to do the analysis (Type C which is
the
> > "whole enchilada" variety) and perhaps to rule out other variables
discussed
> > in other's postings, take a few samples, from the static part of the
pot,
> > from the wave after running at temperature, etc. If all the samples come
> > back relatively the same, then you are good to go, but if one or two
stand
> > out, there could be something worth looking into.
> >
> > Additionally, (yes, another variable) the tin is usually the element
that
> > drops, not the lead. This has me wondering as well. Why?
> >
> > Have a safe and happy holiday!
> >
> > Regards,
> >
> > Ed Popielarski
> > QTA Machine
> > 27291 Jardines
> > Mission Viejo, Ca. 92692
> >
> > Phone:949-581-6601
> > Fax: 949-581-2448
> > Cel: 949-337-2578
> >
> > WWW.QTA.NET
> >
> > "Thank God for America...
> > before it's too late!"
> >
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