I have used in addition to preheating the boards and maintaining
them hot while soldering, a hot tip.  Place a little solder on the tip
and place it against the lead and have the solder bridge to the pad.
This way the heat is transferred to the pad through the solder and the
lead transfers the heat to the barrel. The pad does not have a force
upon it that may move it and lifting it off the board. Practice on a
scrap board. A proven process.
	Good luck
	Ramon
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kevin Glidden
Sent: Thursday, January 25, 2007 3:20 PM
To: [log in to unmask]
Subject: Re: [TN] Assemble question

Preheat the pcb.  It will reduce the temp and dwell of the iron on the
pad.
Also make sure the iron tip is appropriately sized (geometry).



Kevin Glidden
Manufacturing Engineer
Astronics Luminescent Systems Inc.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bill Dworak
Sent: Thursday, January 25, 2007 3:01 PM
To: [log in to unmask]
Subject: [TN] Assemble question

I am in need of some help with regards to assemble. I am a PCB
manufacture and have built a group of boards for one of my accounts and
they are having issues assembling and have asked me for help on the
issues they are having.

 The product is 4 layer board power and ground planes with 2 OZ copper
inner layers the outer layers are 5 OZ copper. What is happening is that
because of the construction of the board it is acting like a big heat
sink and this is where the problems are coming from. These are old
through hole designs they are assembling them by hand they are heating
the irons way up causing surface issues on the boards and in some cases
lifting of pads is resulting when extreme heat is applied they are
heating them up a lot because of all the copper and as I am being told
the solder is not melting the way that it should. 
 Any suggestions to make this a smooth build ? 
 Thank you. 

Bill Dworak













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