Hello Peter - well, something is wrong as 3 seconds of dwell in a SAC305
selective solder should not produce that result. How confident that the 3
second value is correct?

Dave Hillman
Rockwell Collins
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On Tue, Jul 8, 2014 at 3:32 PM, Peter Wong <[log in to unmask]> wrote:

> Hi Everyone,
>
> We ran some assemblies where after selective soldering with SAC305, the
> phosphor bronze leads on a Harwin connector look to have been dissolved.
>  The solder pot temperature is set at 325 deg C and we dwelled on each pin
> for no more than 3 seconds.  We are using an OA flux.  Harwin tells me that
> the melting point of the pins is 954 deg C.
>
> We are having the solder in our selective solder pot analyzed to see if
> there is anything out of spec that could be causing this.
>
> Has anyone else experienced something similar or does anyone have an idea
> as to what could be causing this?
>
> A photo is available at the following link.
> http://ipc-technet.groupsite.com/galleries/show/27385
>
> Thanks
> Peter
>
>
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