When you are seeing spikes on wave solder there are a number of things to
consider.

1. Is the boards being fluxed correctly and is the temperature profile
correct.
2. Could the dwell time in the solder be too long.
3. If the spikes are on one component it may be worth checking the
solderability.

It is unlikely that the copper content in the solder will be too high as the
rate at which copper dissolves in solder reduces as the copper content
increases so at normal operating temperatures it tends to be self
regulating.  However, you should be doing regular checks on your solder
anyway to be sure!

Regards,

Neil

Neil Atkinson




-----Original Message-----
From: Bev Christian [ mailto:[log in to unmask] <mailto:[log in to unmask]>
]
Sent: 27 February 2002 23:35
Subject: Re: Solder Projections


Mr. Pollak,
High copper content in your solder can cause spikes... or amateur hand
solderers like myself are very good at forming spikes.  There may be other
reasons that some of our "older" regulars can contribute.

I looked in IPC/EIA J-STD-006 and it lists max impurity levels for different
elements, but does not give reasons why they are individually considered
impurities.  You may be able to find this info from some of the more common
reference books for our industry, the titles of which you can find by doing
a search of the TechNet archives from the IPC homepage.

regards,
Bev Christian
Research in Motion


-----Original Message-----
From: Mr. Leslie A. Pollak [ mailto:[log in to unmask]
<mailto:[log in to unmask]> ]
Sent: February 27, 2002 3:57 PM
To: [log in to unmask]
Subject: [TN] Solder Projections


Hi,

Could soemone tell me what causes solder projections or what we call
icicles.

Or point us to IPC documentation that would help us.

Thanks
Mr. Leslie A. Pollak

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