TECHNET Archives

February 2000

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:
Kenneth Kirby <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Sat, 29 Jan 2000 13:18:49 -0600
Content-Type:
multipart/mixed
Parts/Attachments:
text/plain (2429 bytes) , pic16377.pcx (2425 bytes)
See comments below.



 (Embedded
 image moved   Eric Kalgren <[log in to unmask]>
 to file:      01/28/2000 02:44 PM
 pic16377.pcx)




To:   [log in to unmask]
cc:    (bcc: Kenneth Kirby/ElectrovertUS/Cookson)
Subject:  [TN] Grainy Looking Wave Solder Joint




Once again I supplicate myself before the altar of TechNet.....

We are seeing dull/grainy looking solder joints coming off the wave solder
machine (Electrovert EconoPak+).
These are high-rel, high mix PCAs that are required to conform to the old
NHB5300.  Specifically the bit about having "bright and shiny" solder
joints.

I am currently profiling the PCA to have an avg topside temp of 250 deg F
when it hits the start of the solder wave.
I suspect, based on my readings of Klein-Wassink that the joints are
cooling too slowly (some of these PCAs have huge ground planes covering the
entire top and bottom side).  That and the fact that the majority of the
dull-looking joints are on heavy components?

My questions:
1)  Should I be profiling to a lower temp?  Yes, if you can still get good
topside fillets.  Also keep the conveyor speed up to minimize the dwell
time but still get top side fillets.

2)  Does anyone have any pet methods for helping to cool the joints more
quickly? A set of cooling fans after the solder pot is all that is needed.
Electrovert offers cooling fans that mount just outside the end cap but you
may need to add a set between those and the solder pot also.

I have been to your your shop before and know Bob Crain.  Give me a call if
you need more info.

Ken Kirby
Speedline Technologies

We are working on getting the spec relaxed, but I think that I should be
able to hit any spec with the correct profile.

Humbly,


Eric Kalgren
BFGoodrich Aerospace
Data Systems Division
[log in to unmask]
(505) 938-5139

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following
text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
additional
information.
If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################




ATOM RSS1 RSS2