Thanks Kevin..
The Solders were chosen after a DOE was done on each comparing them to others alike approx 7yrs ago. We also restrict the operators from using additional flux so that the remaining material left behind has definitely seen temps well above 170oC.. Knowing this I know the flux left behind is definitely benign. However, if additional flux is absolutely needed then there are specific cleaning instructions to ensure nothing corrosive, conductive is left behind. Also, the Kester Flux core we are using is the 66 which contains 3.2% Flux content which allows a much better flow than the standard 2%..
Given this can you see any other reason not to use the Kester for both requirements.
Thanks again,
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Glidden, Kevin
Sent: Monday, December 06, 2010 4:51 PM
To: [log in to unmask]
Subject: Re: [TN] HandSoldering Using NC Solders
Mike,
That's a big one. The answer is that you need to choose the best solder(s) for your application(s). It is likely your two solders were selected by two different people at two different times. When choosing materials, talking to the manufacturers about the products, getting samples, and comparing them head-to-head goes a LONG way. You must also consider reliability. The best flux formulation is simply not the one that allows you to solder a rusty nail to the hull of a ship. An important factor is how you plan to clean your parts after soldering is all done, how well you can ensure you get all the residues removed, and the potential impact of any residues remaining on the assemblies. I suggest you start by reading through some tech articles on cleaning. This forum, the industry magazines, Foresite, and ACI are some good starting resources. Bottom line - you don't pick solder materials solely on the basis of supplier or cost.
Good luck.
-----Original Message-----
From: Mike Laroe [mailto:[log in to unmask]]
Sent: Monday, December 06, 2010 4:06 PM
To: [log in to unmask]
Subject: [TN] HandSoldering Using NC Solders
Currently my company has been using two different Alloys for handsoldering
both Leaded and RoHs No-Clean Assy's. For the leaded requirement we are
using AIM and for Rohs we are using Kester. We currently stock 4 different
sizes of each (.015", .020", .025", .031").. My question and thought is to
phase out the AIM and strictly only use the Kester for both Leaded and Rohs
Assy's. All the Soldering is done with Metcals using the 700 & Pwr Tips. Are
there any reasons I shouldn't do this?
Thanks for your help in advance,
Mike Laroe
Mfg Engineer
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