Apperance do have some weight:
(1) as for eutectic solder of 63/37: shining means Sn rich oxide with
very thin layer on the surface. Not so "shining" means Pb rich oxide
sometimes = un-stable oxide on the surface (cause by many reasons, e.g.
not wash water soluble flux on time, etc.etc.etc)
(2) ENIG - can't say anymore than all of you already said
(3) cold solder joints are normally not shining
(4) other many "wrongful" "should not happen" stuff...
I would like to have shining joints if I do have choice...at no cost, of
cause....(give the choice of proof all the possible cause of "non
shining" have no reliability issue, it might be cheaper to give someone
a "shining" one ;-).
jk
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Poh Kong Hui
>Sent: Thursday, March 13, 2003 5:29 PM
>To: [log in to unmask]
>Subject: Re: [TN] : Shining smooth solder joint on ENIG or
>Gold plating Board.
>
>
>Hi Dave,
>
>To have s shiny joint, I mean very shiny joint is the
>customer's requirement. I understand that gold will influence
>the surface texture, but not the customers.
>
>They follow strictly the very old thinking that appearance
>define reliability and good solder joint.
>
>Anyway, I am still cracking my head on resolving this issue.
>
>Thanks.
>
>Poh
>
>
>
>
>
>At 08:21 AM 2/27/03 -0600, Dave Hillman wrote:
>>Hi Poh! I just have to ask the question - "Why do you want a shiny
>>solder joint"? A solder joint's surface texture has very little to do
>>with its quality and use environment integrity. The JSTD-001 and 610
>>committees have acknowledged that fact with the elimination of
>>requiring solder joints be "bright and shiny". Certain metallizations
>>(such as gold) can influence the solder joint surface texture
>but have
>>no impact of reliability. Reliance on a solder joint's
>appearance as a
>>measure of qualify can be a dangerous assumption.
>>
>>Dave Hillman
>>Rockwell Collins
>>[log in to unmask]
>>
>>
>>
>> Poh Kong Hui
>> <[log in to unmask] To:
>[log in to unmask]
>> M.SG> cc:
>> Sent by: TechNet Subject: [TN]
>: Shining
>smooth solder joint on ENIG or Gold plating Board.
>> <[log in to unmask]>
>>
>>
>> 02/27/2003 06:18
>> AM
>> Please respond to
>> "TechNet E-Mail
>> Forum."; Please
>> respond to Poh
>> Kong Hui
>>
>>
>>
>>
>>
>>
>>Hi Technetters,
>>
>>Can someone advise me how to get a good smooth shining solder
>joint on
>>the ENIG board or board with gold plate SMT pads.
>>
>>As I can understand that board subjected to reflow soldering, the
>>solder joint tends to look dull and not so smooth joint. But,
>is there
>>any way to get a good shining joint.
>>
>>Thanks.
>>
>>Poh
>>
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