TECHNET Archives

October 2008

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Werner Engelmaier /* <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Thu, 16 Oct 2008 11:04:01 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (201 lines)
 Hi Grunde,
Tombstoning is only a problem if you use soldering pads designed for wave soldering—these are definitely suboptimum for reflow and wave soldering.

Werner


 


 

-----Original Message-----
From: Grunde Gjertsen <[log in to unmask]>
To: [log in to unmask]
Sent: Thu, 16 Oct 2008 1:29 am
Subject: Re: [TN] FW: [LF] Vapor Phase Soldering










Apart from tombstoning that is in my experience much worse than with 
convection.
Another thing with VP, how do you document your temperature profile?

Grunde





"Stadem, Richard D." <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
15.10.2008 17:51
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
"Stadem, Richard D." <[log in to unmask]>


To
[log in to unmask]
cc

Subject
Re: [TN] FW: [LF] Vapor Phase Soldering






 I should also opine that when soldering RoHS-compliant assemblies using
lead-free solder paste, you will probably get a much better yield with
VPS than you ever will with convection. Especially in the case of SAC
solders. 

There, I said it. Listen to the screams.....

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Wednesday, October 15, 2008 10:38 AM
To: [log in to unmask]
Subject: [TN] FW: [LF] Vapor Phase Soldering

 

-----Original Message-----
From: Stadem, Richard D. 
Sent: Wednesday, October 15, 2008 10:34 AM
To: '(Leadfree Electronics Assembly Forum)'; 'Tony Ingano'
Subject: RE: [LF] Vapor Phase Soldering

VP soldering is
 great for reflow of massive or hard-to-solder assemblies
or when doing certain subassembly processes (socket manufacturing, etc.)
They are an invaluable tool in any manufacturing facility. There are no
process drawbacks with using the modern VPS machines, better preheaters
and sumps fixed the issues of thermal shock and excessive vapor fluid
use. 3M's Fluorinert and Galden PFPE fluids are safe to use from an
environmental standpoint, per our PCA state offices. 
You must recognize that VPS requires some amount of thermal shock in
order to facilitate the condensation action, but it is not usually so
large as to hurt the reliability of most standard SMT components. There
may be some heat-sensitive components that you would not want to solder
with VPS, however. You need to do the homework before jumping in and
running production hardware with VP. Homework is spelled
q-u-a-l-i-f-i-c-a-t-i-o-n, which should include thermal cycling.

But we get a lower DPMO when using VPS than we do with convection reflow
ovens. Better, more uniform heat transfer = better solder wetting.
I have used R&D Technical Services machines, Model RD1 and RD2, and they
have worked extremely well for the companies that I work with. Find them
at:
http://www.rdtechnicalservices.com/index.html

Disadvantages are the cost of the fluids, and the machines require more
cleaning (maintenance) due to the amounts of flux contamination on the
insides of the chamber from the vapor. We have our maintenance people
thoroughly clean them each month as a means of preventing=2
0oxidation of
the internal chamber parts.

We use two temperatures of fluid, depending on the application. I am
still waiting for Galden and 3M to get schmart and provide the different
fluid tempertures in different colors so it is easier to avoid using the
wrong temperature fluid.

Anyone know of an inert dye that I can add to the fluid that would not
affect its performance?

-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Tony Ingano
Sent: Wednesday, October 15, 2008 8:14 AM
To: [log in to unmask]
Subject: [LF] Vapor Phase Soldering

I am wondering if anyone is currently using vapor phase soldering.  What
are the disadvantages of vp soldering?  Also, who are the major
manufacturers of VP soldering machines?

Thanks,

Tony

------------------------------------------------------------------------
-------Leadfee Mail List provided as a service by IPC using LISTSERV
1.8d To unsubscribe, send a message to [log in to unmask] with following
text in the BODY (NOT the subject field): SIGNOFF Leadfree To
temporarily stop/(start) delivery of Leadree for vacation breaks send:
SET Leadfree NOMAIL/(MAIL) Search previous postings 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 15.0 To
unsubscribe, send a message to=2
[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 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
-----------------------------------------------------


---------------------------------------------------
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 tempor
arily 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 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
-----------------------------------------------------

ATOM RSS1 RSS2