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December 2010

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Subject:
From:
Tom Burek <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Tom Burek <[log in to unmask]>
Date:
Wed, 15 Dec 2010 14:55:43 -0700
Content-Type:
text/plain
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text/plain (101 lines)
Thanks Rex, 
Your response raises the question, What happens to the No-clean Flux that 
is trapped between the PCB and the carrier and does not get activated? 
How do you clean it off or what steps do you take to de-activated the 
flux?  Does this un activated flux lead to contamination (i.e electro 
migration) problems later on? 
Once again this is a No-clean flux.

Thanks again for the response and thank you to the others who responded 
also.

Tom Burek, CID+
Ametek/VIS



From:   "Rex Waygood" <[log in to unmask]>
To:     "TechNet E-Mail Forum" <[log in to unmask]>, "Tom Burek" 
<[log in to unmask]>
Date:   12/15/2010 07:56 AM
Subject:        RE: [TN] No-Clean flux with a Wave pallet



We use a No Clean VOC free flux with selective carriers.
An area of concern is that this requirement demands a good preheat
system.
The selective carriers produce regions where liquid flux can be trapped
between the pcb and the carrier.
Failure to adequately preheat produces problems where the entrapped
liquid flux hits the wave.

We use a Miele industrial dishwasher to keep the carriers clean. The
carriers are cleaned to avoid H&S issues where flux residue builds up on
the carriers and comes into contact with operator's skin. The carriers
just go through the machine periodically, not every time they are used.

Regards
Rex

Rex Waygood
Technical Manager
 
Hansatech EMS provides value manufacturing through engineering and
quality
 
Hansatech EMS Limited
Benson Road
Nuffield Industrial Estate
Poole
Dorset
BH17 0RY
 
+44 (0)1202 338200





-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tom Burek
Sent: 14 December 2010 17:07
To: [log in to unmask]
Subject: [TN] No-Clean flux with a Wave pallet

Season Greetings All,
In the opinion of all the experts out there, are there any issues I need
to be aware of in using a No-Clean flux while using a wave pallet?
I am trying to wave solder some through hole pins on a SMT assembly
(populated 2 sides).
Are there flux spray heads that can limit the flux to the exposed pins
in the wave pallet?
How often do the wave pallets need to be cleaned between each run?
I would be most interested in any stories of disaster or success on this
issue.

Thank you in advance and Best wishes to all for a prosperous New Year.


Tom Burek, CID+
Ametek/VIS





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