The test temperature in J-003 has been 235C back at least six years, to rev B. That was before lead-free.
Denny Fritz
-----Original Message-----
From: Guy Ramsey <[log in to unmask]>
To: [log in to unmask]
Sent: Tue, Aug 11, 2009 9:30 am
Subject: Re: [TN] PCB wetting issue saga, final question
Uh, well, it didn't used to be that way. But, the consensus of the members
f the committee was the use of rosin flux did not represent the real world.
o, they switched to a mildly active flux as the baseline. Can't speak the
election of the test temperature. 235 does sound high.
When I do this type of testing I use our flux and lower temp, 215-220. If
he results are bad I call it a failure.
----Original Message-----
rom: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
ent: Tuesday, August 11, 2009 8:52 AM
o: [log in to unmask]
ubject: [TN] PCB wetting issue saga, final question
Hello Technos,
I have been asking questions on Technet about some wetting issues we see on
particular board and got many useful answers. In the end we've had the
oards tested for solderability by respectable labs and the bare boards
assed J-STD-003 testing with flying colors.
To back track a little bit, the original doubt came from the fact that in
eflow, the solder does wet very well on both the board and the component in
he component pin area, but would stop spreading pretty far from the land's
nd. It just stops spreading, even though the wetting angles at the stop
oints ar
e very low, so denoting excellent wetting.
And here comes the question: why is testing per J-STD-003 done at 235 C and
ith a rather aggressive flux, when the reflow soldering takes place at 205
(HASL finish) using a milder flux (I am using WS, but it could very well
e no-clean...)?
Thanks,
Ioan Tempea, ing.
Ingénieur Principal Fabrication / Sr. Manufacturing Engineer
30 ans déjà! - Already 30 years!
950 rue Bergar, Laval, Québec, H7L 5A1
t : 450-967-7100 ext : 244
Mtl : 514-990-5762
f : 450-967-7444
[log in to unmask] <mailto:[log in to unmask]>
www.digico.cc <http://www.digico.cc/>
P N'imprimer que si nécessaire - Print only if you must
--------------------------------------------------
echnet Mail List provided as a service by IPC using LISTSERV 15.0
o unsubscribe, send a message to [log in to unmask] with following text in
he BODY (NOT the subject field): SIGNOFF Technet
o temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
o receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
earch the archives of previous posts at: http://listserv.ipc.org/archives
lease visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
or additional information, or contact Keach Sasamori at [log in to unmask] or
47-615-7100 ext.2815
----------------------------------------------------
---------------------------------------------------
echnet Mail List provided as a service by IPC using LISTSERV 15.0
o unsubscribe, send a message=2
0to [log in to unmask] with following text in
he BODY (NOT the subject field): SIGNOFF Technet
o temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
o receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
earch the archives of previous posts at: http://listserv.ipc.org/archives
lease visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for
dditional information, or contact Keach Sasamori at [log in to unmask] or
47-615-7100 ext.2815
----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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
-----------------------------------------------------
|
