请问,谁有IPC-TM-650的标准?
From:
TGAsia [mailto:[log in to unmask]] On Behalf Of Hermus
Leung
Sent: Monday, September 01, 2008
2:19 PM
To: [log in to unmask]
Subject: Re: [TGA] Soldering
Nickel on PCB
You may try spot welding for nickel.
Hermus Leung
Technical Service Engineer, 3M
Victoria Centre, 5/F., 15,
Fax : (852) 2969-5758
Tel : (852) 2806-6407
eMail : [log in to unmask]
victor
<[log in to unmask]> 09/01/2008 09:02 AM
|
|
Mr
Katzko,
Thanks
for your quick response.
Here
is the detailed information about the product and the process. Hope this will
be helpful for you to understand my problem.
The
nickel tab is nearly pure Nickel (Ni 201), we buy nickel (like a piece of
paper) and cut it to the size 0.005* 0.100* 1.00 inch and 0.005* 0.100* .40
inch. The nickel is packed in tape and reel like normal chip SMDs. The nickel
tab is placed on the board by chip mounter like normal SMT process.
The
solder paste we are using is Senju M705-221BM5-4211, it is Sn96.5%Ag3.0%Cu0.5,
so called SAC305.
We
are using Rehm V7 reflow oven with N2. The peak temp is 242~246 deg. C. Time
above 220 is 35~44 sec.
The
problem we are suffering now is that nickel tab is prone to fall off when peel
force is applied. The solder remained on the PCB pad when the nickel tab was
peeled off.
Pls
see the attached pictures for reference.
Thanks
for your attention.
Victor
Zhou
在2008-08-31,[log in to unmask] 写道:
Hi Friends,
Here is my concerns about the soldering of nickle. Pls
share your valuable knowledge and experience with me.
1. How to judge the strength of solder joint of nickle
with lead-free solder? Any spec?
2. What can I do if I found the solder joint of
nickel tab is not strong enough?(The soldered nickel tab is very easy to fall
off when you peel it.)
Thanks,
Victor
超大花房赠送,60万轻松入住顺鑫花语[attachment "Nickel.JPG" deleted
by Hermus K. Leung/HK-HongKong/3M/US]
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