Alloy42 requires higher reflow temps and longer time at the higher temp to
allow the dissolution of the alloy into the soldering alloy. I've seen 'poor
wetted' joints with Alloy42, where the wetting has been excellent, great
flux, great reflow, soldered right up the elbow, but no joint of any
integrity because the temp and time was too low and too short to dissolve
the Alloy42 finish.
Best regards,
Andrew Hoggan
BBA Associates Ltd
www.bba-associates.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Bev Christian
Sent: 08 October 2001 14:19
To: [log in to unmask]
Subject: Re: [TN] Poor wetting on solder joints
Or how about "great" wetting that is in actuality really poor wetting?!
Alloy42 with stamping oil on it, covered with a solder finish by the
supplier, used in production, a unit then dropped and then the real truth
evident!
Bev Christian
Research in Motion
-----Original Message-----
From: Charles Caswell [mailto:[log in to unmask]]
Sent: October 6, 2001 2:54 PM
To: [log in to unmask]
Subject: Re: [TN] Poor wetting on solder joints
Wow, how long an answer do you want? saw Steve' reply and agree that
"poor wetting" is sometimes a perception rather than reality. In
addition to what Steve described I have had several other "poor wetting"
issues that took considerable explanation to quality. A tapered lead
that has a large shoulder may have solder suddenly stop because of the
rapid heat dissipation at the larger area. This was being rejected
untill I could finally convince QA. of what was happening. Give us some
more info and I am sure you will get several relevant replies.
Charles Caswell
Process Lead, PCB
Frontier Electronic Systems
-----Original Message-----
From: TechNet E-Mail Forum. [mailto:[log in to unmask]]
Sent: Friday, October 05, 2001 8:59 AM
To: [log in to unmask]
Subject: [TN] Poor wetting on solder joints
What could be the cause of poor wetting on solder joints and how we can
solve it?
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