Bev,

I doubt.  Either, the always present solder oxide will deny wetting of the 
component , or , if you could remove any oxide effectivly, the capillary 
forces would drown the component completely, so when you lift up the object 
from the solder 'pot',  you will just see a big drop of solder hanging 
around the component. You will not get any useful information in terms of 
wetting angle......that's so far I can see it from my participating in 
wetting balance courses many years ago.  Sad enough, our wetting balance has 
been unused for years, because we couldn't make any persons interested  in 
the theory and be responsible for using and maintain the machine. There is 
no aura around soldering amongst the younger generation.

However, there are methods how to solder micronsized components by mastering 
boths the oxide formation and the wetting mechanisms.  It's called solder 
fluidic nanosoldering technology.  Studies have been done how to select the 
suitable solder alloys,  acidous oxide removers, matching temperture and 
other factors that makes nanocomponent self aligning possible.  It's far 
from ordinary PWB mounting . If you are interested, I can send you a paper 
about that topic.

Inge



--------------------------------------------------
From: "Bev Christian" <[log in to unmask]>
Sent: den 30 April 2010 18:09
To: <[log in to unmask]>
Subject: [TN] Results of two survey questions

> Technetters,
>
> Here are the results of a couple of quick surveys that Bob Willis kindly
> carried out for me.  I find it interesting that 7 companies (or at least
> 7 people - all same company?  J  ) claim they can test 01005s on a
> wetting balance!  Comments?
>
>
>
> The second one ties into my interest on wetting to OSP coated pads.
>
> Bev
>
> RIM
>
>
>
> [log in to unmask]
>
>
>
>
>
>
>
> How do you measure solderability on 01005 components?
>
> Use & hope for the best
>
> 13
>
>
>
> 44.8%
>
>
>
>
>
> Soldering to sample board
>
> 9
>
>
>
> 31%
>
>
>
>
>
> Wetting balance
>
> 7
>
>
>
> 24.1%
>
>
>
>
>
> Controlled dip & look
>
> 0
>
>
>
> 0%
>
>
>
>
>
>
>
> Number of Voters
>
> :  29
>
>
>
> Do you require positive wetting angles for joints regardless of metal or
> organic pad finish?
>
> Yes
>
> 15
>
>
>
> 75%
>
>
>
>
> No
>
> 3
>
>
>
> 15%
>
>
>
>
> Don't Know
>
> 2
>
>
>
> 10%
>
>
>
>
>
>
>
>
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