Jared,
We use ANSI/J-STD-003 (april '92) which requires a solder pot of 245C
+/-5 or 473F. It does require using a non-activated rosin flux or
another flux if agreed upon between the user and vendor. I've done this
test and have tried a number of various fluxes. My experience has shown
that I find no difference in solderability between flux as I go from
fully activated to non-activated (using Kester brand). However, we've
recently tried no clean flux and have noticed a difference,
specifically, poorer solderability. The reason I don't think the regular
fluxes make much difference is that they mainly acting as wetting agents
since there is no preheat present to allow the flux to do it job.
Lastly, the test is good and can easily catch gross solderability
problems. It's the marginal cases that are hard to catch with this test.
That's one reason we tried the no clean, to more accurately similate
what's being used in mfg.
Sincerely,
Paul Terranova
DIGITAL's Analytical and Environmental Test Services Lab
Phone: 508-467-3109
FAX: 508-467-6796
[log in to unmask]
http://www.digital.com/lab-services
-----Original Message-----
From: Jared Lang [mailto:[log in to unmask]]
Sent: Friday, July 17, 1998 6:16 PM
To: [log in to unmask]
Subject: [TN] Lead Solderability
Importance: High
Hi Technetters,
I have a question that I need an answer to. I am having an ongoing
battle with one of our T/H power resistor vendors.
My question is:
In testing the lead solderability of a component, if the solder pot is a
>600 deg, would this be sufficient to burn off the oxides on the leads
and give an indication of acceptable lead solderability in the absense
of flux.
The QC tech set-up this procedure last year before he left and it was in
place before I arrived. I have evaluated ANSI J/STD-002 test method A (
I have not had time to find out if there is an appropriate IPC standard)
and we can use this, but the vendor is screaming because we were not
using a "true" procedure.
In an attempt to validate this, last year, I sent a sample of resistors
from a lot that failed to an outside lab and they confirmed the
indication of failures.
Any input will be greatly appreciated, since I have to meet with the
vendor next wedensday to resolve this.
Thanks in advance,
Jared Lang
Manufacturing Engineer
Minarik Corp.
Glendale, CA.
818-637-7434
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