Ioan
I can suggest that you could try vapour-phase soldering. You would
use 2 different boiling-point fluids 220 or 230 for the lead-free and
200 for the tin/lead. It has worked OK in trials we have done but I
cannot attest to the quality/reliability of the solder joint - yet!
Kindest regards
Graham Naisbitt
[log in to unmask]
www.gen3systems.com
Phone: +44 (0)12 5252 1500
Mobile: +44 (0) 79 6858 2121
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
Unit B2, Armstrong Mall
Southwood Business Park
Farnborough Hampshire
GU14 0NR - UK
ENGINEERING RELIABILITY
IN ELECTRONICS
DISCLAIMER : This message is intended only for the use of the
individual or entity to which it is addressed and may contain
information which is privileged, confidential, proprietary, or exempt
from disclosure under applicable law. If you are not the intended
recipient or the person responsible for delivering the message to the
intended recipient, you are strictly prohibited from disclosing,
distributing, copying, or in any way using this message. If you have
received this communication in error, please notify the sender and
destroy and delete any copies you may have received. Any views or
opinions presented in this email are solely those of the author and
might not represent those of Gen3 Systems Limited. Although Gen3
Systems Limited has taken reasonable precautions to ensure no viruses
present in this email, Gen3 Systems Limited can not accept the
responsibility for any loss or damage arising from the use of this
email or attachments.
On 18 Sep 2006, at 17:26, Tempea, Ioan wrote:
> Hi Technos,
>
> I have a lead-free board, but some nasty leadless comps are only
> available leaded, so not supporting 240C.
>
> I am thinking what about soldering everything that works at lead-
> free temps and then make another soldering pass at about 210C with
> these comps only. Will this affect the reliability of the lead-free
> joints, since the solder will get almost pasty? Did anybody try this?
>
> I agree with the ones that will say: "what the heck, they cannot
> give you compliant parts, don't do it", but it is an important
> project, the customer knows what this means, but they want to risk.
>
> Btw, I have to make sure the original reliability of the lead-free
> joints, as good as it is, will not be latered, it is a high-rel
> application.
>
> Thanks,
>
> Ioan
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 1.8e
> To unsubscribe, send a message to [log in to unmask] with following
> text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail
> to [log in to unmask]: SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to
> [log in to unmask]: SET Technet Digest
> Search the archives of previous posts at: http://listserv.ipc.org/
> archives
> Please visit IPC web site http://www.ipc.org/contentpage.asp?
> Pageid=4.3.16 for additional information, or contact Keach Sasamori
> at [log in to unmask] or 847-615-7100 ext.2815
> -----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
