Hi Poh! I had a mentor who told me that sometimes the only way to change a
basis is to wait for the individual's retirement! It's too bad that your
customer insists on a visual crutch for quality reliance. Other Technet
guru's have suggested your only alternative - work with the soldering
process profile to minimize the solder joint surface texture
characteristics. Good Luck.

Dave



                      pohkh
                      <[log in to unmask]        To:       "TechNet E-Mail Forum." <[log in to unmask]>, [log in to unmask], Dave
                      m.sg>                     Hillman <[log in to unmask]>
                                               cc:       [log in to unmask]
                      02/27/2003 04:14         Subject:  Re: [TN] : Shining smooth solder joint on ENIG or Gold plating Board.
                      PM
                      Please respond to
                      pohkh






Hi Dave,

The problem is that I'm having extreme stubborn customer that insists to
meet the requirement.

I do not know how they do it, but those sample boards that they have showed
me is of smooth shining joint.

I doubt they rework all boards, as each board consists, at least 2000
solder joints.

Poh


--- Dave Hillman <[log in to unmask]> 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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