May I suggest a small refinement?
Pre-solder the pad. Now you can lay the wire on the pad then apply iron. The
solder, being pre-wetted to the pad, will be restrained from wicking up the
wire. You may need to add tiny amount of flux, or you could pre-tin the flex
also and then reflow together. Either way have an adequate tip so as to keep
time short.
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gregg Owens
Sent: Friday, August 19, 2011 6:55 PM
To: [log in to unmask]
Subject: Re: [TN] Solder Wicking
Dick:
The current process is to hand solder them, but your idea would provide a
greater control of the solder to be introduced to the wire. Thanks,
Gregg
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard D. Krug
Sent: Friday, August 19, 2011 10:53 AM
To: [log in to unmask]
Subject: Re: [TN] Solder Wicking
You may be able to limit wicking by control of solder volume through use of
a properly sized solder preform.
Dick Krug, SSBB, CSMTPE
SMT Process Engineer
Sparton Corporation
30167 Power Line Road
Brooksville, FL 34602-8299
p (352) 540-4012 (Internal Ext. 2012)
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gregg Owens
Sent: Friday, August 19, 2011 1:40 PM
To: [log in to unmask]
Subject: [TN] Solder Wicking
Technetters:
I have a unique application question. We have a part which is to be attached
to the PCB by a wire. The wire is stranded 22AWG and is only 450 mils long.
The assembly's operational environment has vibration. Therefore it is
critical for the wire to minimize solder wicking and remain as flexible as
possible. However the short length presents quite a challenge. So other than
a anti-wicking tool does anyone have any great ideas to limit solder wicking
in such an application?
I was thinking of suggesting using un-fluxed solder wick to improve
flexibility. Any additional thoughts? Thanks!
Gregg Owens
Wavestream Corporation
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