LISTSERV - TECHNET Archives - LISTSERV.IPC.ORG

TECHNET Archives

March 2002

TechNet@IPC.ORG

	LISTSERV Archives
	TECHNET Home
	TECHNET March 2002

	Log In
	Register

	Subscribe or Unsubscribe

	Search Archives

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 >>]

Subject:	Re: ENIG AND NON WETTING
From:	Earl Moon <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Mon, 11 Mar 2002 05:57:13 -0600
Content-Type:	text/plain
Parts/Attachments:	text/plain (42 lines)

Daan,

As always, I appreciate your input. To clarify, the boards were freshly
received from a major international supplier. I instructed our assembly
house (the same major international supplier - how about that for strategic
planning as the same boards, in volume will be, guess what, assembled by the
same major international supplier in another location) to reflow and wave
solder the solder samples. The supplier wave soldered the side in which I
had little interest. It was the SMT side, with all the little bastard TI
CSP's that held the most interest for obvious reasons or that should have
been obvious to all as it's all I've been yacking about for two months to
you all and all prospective suppliers.

I got the wave results last week with the non wetting as I described. The
wave solder process was "normal" to the major international assembly
operation with flux type, flux application, conveyor speed, wave types, wave
height, preheat temps, solder temp, and all the other stuff we all know and
love about wave soldering and its process management requirements.

The board showed, clearly, non wetting on some bottom side SMT pads, at
about 50% non wetted. It also showed, clarly through hole pads about 50%, by
quantity, non wetted with some obviously adhacent.

My question, again, is what in the ENIG, over bare copper after SM
application, is possibly affecting this type solderability. It's a mystery
worth more investigation.

Again, thanks Daan and I hope I clarified.

Earl

---------------------------------------------------------------------------------
Technet Mail List provided as a free 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 Technet
To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------

ATOM RSS1 RSS2

LISTSERV.IPC.ORG