Hi Clarles,
If you are talking about the smooth shining solder joint on the through hole components, I experienced using nitrogeneous wave solder machine provided that. However, one needs to control the oxygen ppm level in the wave soldering machine.
My experience is on tunnel wave machine, the SEHO system, and the O2 level must be less than 10ppm.
I missed the N2 machine so much.
Poh
--- Charles Caswell <[log in to unmask]> wrote:
> I can sympathize. I had customer ( quality guy ) who had NO
> experience with circuit boards or soldering prior to our contract.
> In our case it was through hole and the affected joints were limited
> to certain pins on certain parts. I actually had to empty my wave
> solder and fill it with new solder. The advice to keep time over
> liquidus is about the best I know to do. Nitrogen might help.
>
> -----Original Message-----
> From: pohkh [mailto:[log in to unmask]]
> Sent: Thursday, February 27, 2003 4:14 PM
> To: [log in to unmask]
> Subject: Re: [TN] : Shining smooth solder joint on ENIG or Gold
> plating
> Board.
>
>
> 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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