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April 2016

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Subject:
From:
George Wenger <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Mon, 18 Apr 2016 20:45:14 +0000
Content-Type:
text/plain
Parts/Attachments:
text/plain (112 lines)
Ricardo, 

IPC TN stripped off your photo again. Please send the photo to Steve directly. If you respond to this email and attach the photo he will get it because I put his email address in the email chain 

----- Original Message -----

From: "Ricardo Moncaglieri" <[log in to unmask]> 
To: [log in to unmask] 
Sent: Monday, April 18, 2016 4:35:12 PM 
Subject: Re: [TN] Solder Cracking After Thermal Cicling 

Steve, 
Attached arethe pictures. 
Thank you a lot. 
Await for your comments. 
brgds,Ricardo 

>>> Steve Gregory <[log in to unmask]> 18/04/2016 15:22 >>> 
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 
> 
> 
> 
> 
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