[TowerTalk] solder

[Hans Oortman]

Lead free solder is a pain in the butt.....for rework as well as normal
production.......let me refrase the latter: it needs very accurate control
of the process, i.e. temperature, which is doable but increasing cost of
production.
It is NOT allowed to be used in military, aviation equipment and medical
equipment because of its possible unreliable solder joints on the long term.
Certainly when BGA's are being used. Jurisdiction is available in Germany
whereby manufacturers have successfully challenged the legislation for the
use of RoHS in business to business products because of its unreliability.
The use of RoHS has no positive effect what so ever on the environment,
which in principle has been the driving force for its application. 
Nevertheless it is obligatory for consumer products. The total percentage of
lead in our environment coming from electronics is less than 0.4%. Car
batteries, normal batteries and ammunition are the major contributors of
lead to the environment. We, as electronics manufacturers have been sc....
by the environmentalists for no reason what so ever..... 

Hans Oortman
PA3ARW

-----Oorspronkelijk bericht-----
Van: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] Namens Harold R. Hepner
Verzonden: dinsdag 12 januari 2010 6:22
Aan: TowerTalk at contesting.com
Onderwerp: Re: [TowerTalk] solder


The solder should be ok, it's a non corrosive flux. it's a 50-50 tin 
lead mixture so it needs to cool before it is moved. the eutectic 
63-37 does not have the plastic state that causes cold solder joints 
like the other blends. The water soluble "organic" fluxes are 
suitable for electronics work, however they must be removed or washed 
off within about 4 hours because they are corrosive. The lead free or 
RoHS (restrictions on hazardous substances)  solders are basically 
tin with about 3% silver, it has a higher melting point  and the same 
fluxes are used. Reworking lead free assemblies is a little more 
challenging and mixing lead free and leaded solder does not help. 
There have been roamers that the lead free joints will fracture 
easier that leaded joints with mechanical stress like vibration. Time 
will tell.

Harold AD7QJ


At 10:42 AM 1/11/2010, you wrote:
>"Hello to all on TT. I have a roll of old solder. the label states made in
>england. Alloy Sn 50 ersin muliticore 5 core solder. non-corrosive flux.
Can
>this be used for soldering connectors without that nasty degrigation. Im
>just not sure if it contains lead which is bad. Any help?
>
>tony k2vi"
>
>
>Most electronic grade solder is 60 Sn - 40 Pb with a rosin core. I use a
>water soluble flux Kester 63-37 that I buy from Jenson for all connectors I
>make.
>
>You have to watch for using plumbing solder with an acid core for
electrical
>applications. That can have nasty consequences.
>
>73 Craig
>
>
>Craig Clark K1QX
>Radioware
>PO Box 209
>Rindge NH 03461
>603 899 6957
>
>
>
>
>
>
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