Doug,
My one concern with any chemical cleaners such as Chemtronics is what they can do to
plastics. The HP 8 segment alphanumeric displays we use were cracked by using anything
but hot water to remove flux. We sent a cracked display to HP (now Avago) and they
told us this was the problem and pointed to the datasheet caution:
Soldering and Post Solder Cleaning Instructions for the HDSP-210X/-211X/-250X
The HDSP-210X/-211X/-250X may be hand soldered or wave soldered with SN63 solder. When hand soldering, it is recommended that an electronically temperature controlled and securely grounded soldering iron be used. For best results, the iron tip temperature should be set at 315°C (600°F). For wave soldering, a rosin-based RMA flux can be used. The solder wave temperature should be set at 245°C ± 5°C (473°F ± 9°F), and the dwell in the wave should be set between 11 /2 to 3 seconds for optimum soldering. The preheat temperature should not exceed 105°C (221°F) as measured on the solder side of the PC board.
For additional information on soldering and post solder cleaning, see Application Note 1027, Soldering LED Components.
Bob Landman
H&L Instruments, LLC
On Sep 7, 2010, at 7:13 AM, Douglas Pauls wrote:
> Ohhhh, I beg to differ. Water soluble fluxes are more active and will
> probably do OK for soldering, but they also represent a danger if you do
> not totally remove them or if some of it flows into places and does not
> get rinsed out. What really makes me nervous about your approach is your
> choice of equipment and cleaners. Tap water sucks as a cleaner and hot tap
> water only slightly better. You might be able to remove the visible
> residues, but will still have invisible residues that will cause problems.
> In some cases, you are putting on more contaminants with the tap water
> than you are removing.
>
> We use low residue fluxes here on class three product and have a number of
> cases where the the residues are left in place. It is simply a matter of
> finding a flux and cleaning combination that works well together, and
> limiting the amount of additional flux you add. A skilled operator can do
> soldering with no more flux than is in the core of the wire. You may need
> a slightly larger core.
>
> Ken, I would suggest this short list to you. Use either Kester 245 low
> residue flux (P3 core) or Alpha Telecore Plus (also P3 core). Both are
> standards here and work well for soldering. For topical cleaning
> solutions, try Kyzen's Cybersolv 141b or Chemtronics Flux-Off Heavy Duty.
> Both these cleaning agents work well with the fluxes I named.
>
> Doug Pauls
> Rockwell Collins
>
>
>
> Robert Kondner <[log in to unmask]>
> Sent by: TechNet <[log in to unmask]>
> 09/06/2010 01:27 PM
> Please respond to
> [log in to unmask]
>
>
> To
> [log in to unmask]
> cc
>
> Subject
> Re: [TN] Hand Soldering
>
>
>
>
>
>
> Ken,
>
> In my mind there is absolutely no question, hand assemble using Water
> Soluble flux. A good spray under hot water cleans well.
>
> During final assembly or rework I might use a no clean at spots. The only
> problem is the no clean is VERY DIFFICULT to remove so don't try. It
> detracts from board appearance.
>
> It the spot being reworked is a sensitive analog circuit they rework
> using
> Water Soluble. For anything close to fine pitch SMT you should be applying
> liberal quantities of Water Soluble flux, only way to rework.
>
> You can get a little "Water Pick" real cheap. Load it with hot water and
> you can you can really get down into the nooks and crannies.
>
> Bob Kondner
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Kenneth Wood
> Sent: Monday, September 06, 2010 8:30 AM
> To: [log in to unmask]
> Subject: [TN] Hand Soldering
>
> Hi all.
> What is the best setup for hand soldering as far as solder / cleaner?
> Rosin core? Water soluble? No-Clean?
> What cleaner too?
>
> I've been using rosin core with various cleaners but I have a hard time
> with
> the white residue the cleaners leave.
>
> Thanks
> Ken
>
>
>
>
>
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