Hi Al:
A blow hole can be seen with the naked eye. It starts
somewhere where gases are trapped and blow like a volcano, leaving a
visible hole somewhere at the top. Small gas bubbles can leave voids
that are only visible through X-rays. But blow holes is a much greater
amount of gas that actually erupts leaving a crater. The crater does not
necessarily occur at the highest point in the solder joint. Sometimes
the gases come through just a bit off to one side of the highest point.
Blow holes may be a source for solder balls. See 5.2.2 Soldering
Anomalies - Pin Holes/Blow Holes in IPC-A-610D
Regards,
Ramon
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Al Onderick
Sent: Tuesday, July 11, 2006 10:31 AM
To: [log in to unmask]
Subject: Re: [TN] Blowholes pandemic
Can someone direct me to a picture of a blowhole in a older joint? Is
this seen from the surface or is cross sectioning or xray required?
-Al
-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]] On Behalf Of
[log in to unmask]
Sent: Wednesday, June 21, 2006 12:56 PM
To: [log in to unmask]
Subject: Re: [TN] Blowholes pandemic
Hi Ioan,
Have you tried and extend your soak time to allow the moisture to escape
prior to reaching the liquidus stage. I have seen this problem before
and slowing down the profile does help reduce this problem.
Best regards,
Gilbert Roberge
Technical Support Manager
Amtech Inc.
Ph: 800-435-0317
Fx: 203-481-5033
E-mail: [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan
Sent: Wednesday, June 21, 2006 11:54 AM
To: [log in to unmask]
Subject: Re: [TN] Blowholes pandemic
Multicore WS200 as WS and AIM NC254 as no-clean.
I want to state that both pastes work fine for us and publishing the
details is not related to concerns about their performance.
Ioan
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Stadem, Richard D.
Sent: Wednesday, June 21, 2006 11:41 AM
To: [log in to unmask]
Subject: Re: [TN] Blowholes pandemic
Ioan, which brand and part number solder paste are you using?
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan
Sent: Wednesday, June 21, 2006 10:28 AM
To: [log in to unmask]
Subject: Re: [TN] Blowholes pandemic
One is ENIG with no-clean paste, the other one is HASL (with WS paste).
Thanks,
Ioan
-----Original Message-----
From: Lee parker [mailto:[log in to unmask]]
Sent: Wednesday, June 21, 2006 11:26 AM
To: TechNet E-Mail Forum; Tempea, Ioan
Subject: Re: [TN] Blowholes pandemic
Ioan
It may still be a board problem. I would bake some boards and assemble
some suspect parts. By the way, what board surface finish are you using?
Best regards
Lee
J. Lee Parker, Ph.D.
JLP Consultants LLC
804 779 3389
----- Original Message -----
From: "Tempea, Ioan" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, June 21, 2006 8:56 AM
Subject: [TN] Blowholes pandemic
Hi Technos,
for a couple of days I see occurences of blowholes in the joints of,
guess what, SMT 0603 resistors.
The reflow recipe did not change and we're talking about 2 different
established products, we have run many of each before. One is WS, the
other one no-clean. Each one uses different brand of solder paste, SnPb.
I have changed the paste with fresh one, no positive results. I have
changed the reels with different date codes, Bingo! But even the "bad"
parts were quite fresh, less than one year old. One of them is pure Sn
plated, don't know about the other ones.
The question is: where on Earth can humidity stay in a ceramic resistor?
What else can be the cause of the blowholes? Did not bake the boards,
since changing the components worked, so I guess the PCBs are out of the
hook...
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
-----------------------------------------------------
---------------------------------------------------
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
-----------------------------------------------------
---------------------------------------------------
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
-----------------------------------------------------
---------------------------------------------------
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
-----------------------------------------------------
|
