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43:04 1997 |
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50:14 1997 |
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Stella,
Please talk with your Alpha Metals Representative who may suggest
using NR310H. Also, the flux preheat is very important and has about
a 10-20F process window when you perform your DOE with a profile unit
such as KIC or M.O.L.E. or equivalent.
BW
______________________________ Reply Separator _________________________________
Subject: Solder balls problem
Author: [log in to unmask] at uucpmail
Date: 5/16/97 10:59 AM
Hello, Technetts:
We are experiencing a big problem with solder balls attaching to the bottom
of a through-hole connector during wave soldering.
We just switched to NoClean chemistry (Alpha NR300A2 water based flux).
Solder pallets are used during wave soldering. There is an opening for the
connector in the pallet and connector's plastic body (made from GM7001)
emerges into the solder pot during soldering.
I guess, we have had this problem before , but the solder balls were washed
away during the wash process.
The solder balls on the bottom of the connector are not acceptable per
customer spec.
Any suggestions would be appreciated.
Thank you, Stella Neyman
Lectron Products
ph. 248-608-7289
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