TECHNET Archives

April 1999

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:
Stephen Bonaccorsi <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 1 Apr 1999 12:34:09 +0100
Content-Type:
text/plain
Parts/Attachments:
text/plain (40 lines)
Hello  Everybody

I am currently reflowing with a convection oven (No Nitrogen). A board
that has perfect solder joints apart from grainy solder joints on one
particular component (QFP). Other components on the board resistors/caps
and components of similar size are fine.
Therefore I don't think there is a problem with the oven profile.

This component does go through an extra process before hand.
 Initially the component is supplied with no pins (Very long story,
don't ask!)
These are attached to the body of the component using an aluminum
jig/fixture to hold them in place. The legs are supplied
pre-soldered.
 RMA flux is then applied (liberally) to the area to be soldered.
The jigs with the components are then placed through a vapour phase oven
for soldering .

Is it possible that the legs are being contaminated by Aluminum or its
oxide from the jig/fixture, if the flux is reacting the Aluminum.

Would aluminum contamination give grainy joints?
What else can cause grainy joints?

Thanks for any help

Stephen Bonaccorsi

################################################################
TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################


ATOM RSS1 RSS2