Hi Vit! Let me restate your question and come at it from a different angle:
" Would you expect a solder joint which has proper wetting and acceptable
solder geometry if created by either manual soldering or machine soldering
to perform differently for a given use environment?". My answer would be no
- the initial solder joint metallurgy would be different for a manual
solder joint and a machine solder joint but those differences equalize
within a week of assembly. If you follow best industry soldering practices
(using IPC JSTD 001 and IPC-A-610 requirements/recommendations) you would
not expect a difference in performance between the two methods. However,
with all that being said, the very nature of manual soldering leads to a
smaller window of consistency and repeatability in contrast to machine
soldering practices.  You may have a larger failure rate for manual
soldering processes only because of the consistency window. Hope this
helps.

Dave Hillman
Rockwell Collins
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"Sklenar Vit (RBAU-EB/MGE4)" <[log in to unmask]>@ipc.org> on
12/17/2001 05:43:52 PM

Please respond to "TechNet E-Mail Forum." <[log in to unmask]>

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Subject:  [TN] Reliability of hand soldered solder joint.


Hi Techneters,
does somebody have statistical data or  information regarding the quality
of
a hand soldered joint. What is the expected failure rate compared with a
solder joint formed by machine? Help!

Thank you

Regards

Vit Sklenar MGE4VS
T: (61 3)9541 7734  F: (61 3) 9541 3909
e-mail work:   [log in to unmask]
e-mail home:  [log in to unmask]
> Robert Bosch (Aust) ,
1555 cnr.Centre and McNaugton Road,
> Clayton , VIC 3169, Australia
>

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