I agree that a very strong halide flux is essential for pretinning, but 
you may need more for any alloy more resistant than 18/8/3, including 
ultrasound to break up that ornery refractive oxide.

Brian

On 28/09/2012 18:28, Paul Edwards wrote:
> Torsten,
>
> The last time I did this type of thing I did the following:
>
> Pre-tin S/S soldering areas with the same solder metallurgy as your solder paste using a very active acid flux (I used a hydrobromic acid type flux), wash thoroughly, then place on PCB like regular component and/or RF shield...
>
> Some adjustment need to be made depending (that word again...) on the joint configuration and part...
>
> Paul
>
> Paul Edwards
> Process/Quality Engineering
> Surface Art Engineering
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Torsten Hagge
> Sent: Friday, September 28, 2012 8:17 AM
> To: [log in to unmask]
> Subject: [TN] soldering stainless steel
>
> Hi all,
>
> has anybody experience with soldering stainless steel parts directly on a PCB? What solder process work fine?
>
> Application is a medical sensor with body contacts.
>
> Torsten
>
>
> Kind regards
>
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