Hi Ricardo,

The Technet server strips the attachments, send your photo directly to me
and I'll get it posted...

Steve

On Mon, Apr 18, 2016 at 11:43 AM, Ricardo Moncaglieri <
[log in to unmask]> wrote:

> Dear colleagues;
>
> Steve Gregory, could you please upload the enclosed picture?
>
> Solder become perturbated / cracked after thermal cicling:
>
> This picture corresponds to a plane (not circular) conector terminal
> solded to a pcb pad ENEPIG finished.
> The connector terminal has been gold removed by twice pretin.
> Solder used is Sn63Pb37.
> Thermal cicling: 50°C to 125°C
>
> As picture showed there are stretch marks toward left direction and
> showed solder crack.
>
> Our provider reported temperature didnt pass over 125°C and solder used
> 63/37.
>
> Question:
>
> How could these kind of gooves or stretch marks have been produced
> taking into account they are just toward one direction (left) and of
> considerable length?
> Just mecanic stress?
> Temperature overpassing on any cicle?
> Need of use of different alloy, ie.: In, Bi etc?
> Provider reported the process is being useed from them since long ago
> (same solder alloy, temperature, pcb, terminal conector, thermal
> cicling) but this is the first time they faced with such a cracking.
>
> Do you have any comment in order to anlyse/solve this trouble.
>
> Appreciate your feedback we are in middle of a providing acceptance
> tests space quality level (IPC class 3).
>
> brgds,Ricardo
>
>
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________
>

-- 


This email and any attachments are only for use by the intended 
recipient(s) and may contain legally privileged, confidential, proprietary 
or otherwise private information. Any unauthorized use, reproduction, 
dissemination, distribution or other disclosure of the contents of this 
e-mail or its attachments is strictly prohibited. If you have received this 
email in error, please notify the sender immediately and delete the 
original. 

______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________