Isn't lead-free solder more of dull finish? It could be you are using
lead free solder.
John Babcock
PCB Designer III
Isothermal Systems Research (ISR)
2218 N. Molter Rd
Liberty Lake, WA 99019
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kevin Glidden
Sent: Tuesday, November 08, 2005 9:59 AM
To: [log in to unmask]
Subject: [TN] Grainy Solder Joints
We are experiencing dull / grainy TH solder joints, made by hand
soldering w/ iron @ 500F. At first, it appeared to be residue on the
surface, so I started chasing the cleaner. But all checked out OK. I
refluxed (water soluble, ORH0) and reflowed (iron @ 600F). This
improved the finished appearance, but not 100%. While eutectic, the
joint is perfect. Then when I draw the iron away, it cools and the
surface finish is no longer smooth or shiny. What can cause this?
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