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Date: | Tue, 8 Jul 2014 20:50:47 +0000 |
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Hi Peter-
SAC305 is well known for eroding metals. 325C sounds pretty darned hot to
me! Why so high?
I have run a solder fountain rework station filled with SAC305, and it was
very difficult to stop it from eroding the ends of the via barrels. That was
only at 230C!
Wayne Thayer
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Peter Wong
Sent: Tuesday, July 08, 2014 4:32 PM
To: [log in to unmask]
Subject: [TN] Dissolving pins
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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