Mime-Version: |
1.0 |
Content-Type: |
text/plain; charset="us-ascii" |
Old-Return-Path: |
|
Date: |
Tue, 14 May 1996 21:10:59 +0800 (SST) |
Precedence: |
list |
Resent-From: |
|
Resent-Sender: |
|
X-Status: |
|
From [log in to unmask] Thu May 16 12: |
56:10 1996 |
X-Mailing-List: |
|
X-Sender: |
|
TO: |
|
Return-Path: |
<TechNet-request> |
Status: |
O |
Resent-Message-ID: |
<"_J0Cs2.0.ZfG.PK8cn"@ipc> |
Subject: |
|
From: |
|
X-Loop: |
|
Received: |
by ipc.org (Smail3.1.28.1 #2)
id m0uJJn8-0000CBC; Tue, 14 May 96 08:05 CDT |
X-Mailer: |
Windows Eudora Light Version 1.5.4 (16) |
Message-Id: |
|
Parts/Attachments: |
|
|
Dear Technet,
Whenever, I'm running a 100% through-hole board, that is densely populated
with mainly DIP components, and a only few capacitors and resistors., 20 to
30% of the solder joints are gritty.
It had never happened to board of mixed technology.
I have sent the solder for lab. analysis, and the result is within the
recommended specification.
The Board is :-
10 x 10 sq.inch
4 layers
The wave-solder Machine used :-
The wave-solder machine used is SEHO 2000 - a full-blown nitrogenous tunnel.
The solder pot temperature is set at 245 deg.cel or 473 deg.F.
The top side temperature is measured at about 194 deg.F / 90 deg.C.
Conveyor speed is set 0.90 metre/minute.
The solid content of the flux is 1%.
Could anybody advise me why this is happening, and how to solve it. Our
rework operators are touching every gritty joint.
Poh Kong Hui
Nera Electronics
|
|
|