I have seen some Pin holes (or blow holes) in some assemblies where the
clinching of the parts (done in automatic insertion) is tight, and the main body
of the radial TH components sits flush with the topside of the PWB. The
remaining hole in PWB is actually "covered" not allowing any of the gas build up
to escape, and pin holes appear. I do not know if there is something like this
that any of you have seen
Ivan Barrios



-----Original Message-----
From: Nicholas LAI [mailto:[log in to unmask]]
Sent: Saturday, September 18, 1999 00:01
To: [log in to unmask]
Subject: [TN] Poor solderability


Hello all

Is there anyone can give me some info of pin hole in PTH.
Our end-customer complain that there is poor solderanility of our product.
After micro-section teh problem hole. there is some pin hole on teh PTH
wall. Is
this is teh root cause of the poor solderability.
Any comment?


More, is there any reasons can cause poor solderability(non-wetting)?

Is there any good source can know more about the poor
solderability(non-wetting)?

Best Regard,
Nicholas Lai
9/18/99

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