Hi Sasha!

In all the years that I've been wave soldering, Tin has been the only thing 
to go out of limits...and it's always been out of limits on the low side.

What I understand about that, is that dross is mostly composed of if tin 
oxides, and if you do a lot of waving with the turbulent wave on, you will 
generate a lot more dross than waving with just the laminar wave on, thus a greater 
depletion of Tin. The tin depletion is further magnified if you use something 
like Kleenox when you de-dross your pot because you won't be adding much new 
solder as the Kleenox is pretty good about separating the dross from the 
solder....

That's been my experience anyway...

-Steve Gregory-

Ed,

I like Your declaration about "cold" joints... :) I had a minor war i a 
earlier life with a Q-department about the definition.. :)

I'm not sure it any of us is right or wrong, but why would be Tin that 
drops?
Isn't it density and temparature that is the governing factors in this 
case?

Enyone outthere that can explain this? :)

*************************************************************************
Sasha Miladinovic - Production Engineering 
Amersham Biosciences, PCB Production, Umeå
Tel:      +46 (0) 90 150 232
Fax:     +46 (0) 90 138 372
E-mail: [log in to unmask]

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