Hi Bill,
What might be happening is that the layer of HASL is too thin and almost all Sn is consumed to form intermetallics. You wouldn't see any contamination on the surface, but would have trouble soldering to it, unless a fresh surface is exposed (the surface is scrubbed).
I would be able to confirm that if I had a sample.
Regards,
Vladimir
SENTEC
SENTEC
11 Canadian Road, Unit 7.
Scarborough, ON M1R 5G1
Tel: (416) 899-1882
Fax: (905) 882-8812
www.sentec.ca
-----Original Message-----
From: Bev Christian <[log in to unmask]>
Date: Mon, 15 Jun 2009 14:27:39
To: <[log in to unmask]>
Subject: Re: [TN] Fw: [TN] HAL-Leaded assembly
Bill,
No prob. I should have been able to figure that out. I'm just used to
seeing HASL.
Bev
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bill Dworak
Sent: Monday, June 15, 2009 2:16 PM
To: [log in to unmask]
Subject: [TN] Fw: [TN] HAL-Leaded assembly
Sorry Bev, I am guilty of using terminology that is specific to my end
of
the industry. Hot air leveling (HAL) leaded, means that the surface
finish
is tin lead , I defined it as leaded because there is a leaded as well
as
non-leaded surface finish out there now. This is a military account so
we
cannot use no-lead. I did leave out the materials used typically it has
been
FR4, 130 as well as 170.
Sorry.
Bill
----- Original Message -----
From: "Bev Christian" <[log in to unmask]>
To: <[log in to unmask]>; <[log in to unmask]>
Sent: Monday, June 15, 2009 10:53 AM
Subject: Re: [TN] HAL-Leaded assembly
Bill,
Not enough info!
What surface finish?
What board type?
What environment boards stored in?
How long between manufacture of boards and use?
Bev
RIM
----- Original Message -----
From: TechNet <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Sent: Mon Jun 15 13:47:51 2009
Subject: [TN] HAL-Leaded assembly
Hello everybody, I am looking for some knowledge on what I see is a
basic
type problem that is driving me crazy. I am a sales guy who covers a
sizable
territory and in that territory for a PCB manufacturer (yes one of
those) I
have one account that I have been working with for about 4 years now
that
continuously has issues assembling both hand assembly as well as pick &
place.
The surface finish is HAL (leaded) this is a military account that is
pretty
well structured in their processes. What I get told is that there seems
like
a contamination is on the surface when they scrub the surface it makes
it
better but not 100% better.They have sent back samples for us to look at
,
we saw nothing on the surface no contamination nothing wrong at all.
If this was one of a few that has the same or similar issues it would
make
some sense and I could go to the people I work with asking them to look
into
this issue. But it is the only company that has this issue.
Has anybody seen a similar type of a situation before? Understood that
you
cannot fix this but would appreciate advise as to where to look so
hopefully
this can be solved.
Thank you.
Bill Dworak
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