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June 2006

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Subject:
From:
"H. Molema" <[log in to unmask]>
Reply To:
(Leadfree Electronics Assembly Forum)
Date:
Mon, 19 Jun 2006 16:51:08 +0200
Content-Type:
text/plain
Parts/Attachments:
text/plain (125 lines)
At this moment we are using a Low Melting Point with lead, in this situation
it isn't a problem that the transformers are soldered with 63/37. But the
application has to be converted to lead free.

 -----Oorspronkelijk bericht-----
Van:    Leadfree [mailto:[log in to unmask]]  Namens Steve Gregory
Verzonden:      maandag 19 juni 2006 16:21
Aan:    [log in to unmask]
Onderwerp:      Re: [LF] Tin eating our copper wire

Hi Hilbrand!

Just curious, if you are soldering them using 63/37, why are they being
assembled with a lead free solder?

-Steve Gregory-

-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of H. Molema
Sent: Monday, June 19, 2006 8:53 AM
To: [log in to unmask]
Subject: Re: [LF] Tin eating our copper wire

Hi Chris,

The specific boards are now soldered with a low melting point 43/43/14,
Sn/Pb/Bi and the transformers are soldered with 63/37 Sn/Pb.
We haven't tried to solder them on the boards on the boards yet because the
transformers are tested before assembly.
It is an SMT component so we pick&place and reflow it..

Hilbrand.


 -----Oorspronkelijk bericht-----
Van:    James, Chris [mailto:[log in to unmask]]
Verzonden:      maandag 19 juni 2006 13:18
Aan:    H. Molema
Onderwerp:      RE: [LF] Tin eating our copper wire

Even if you succeed in getting them tinned you may still end up dissolving
them when you solder them into a circuit. We have seen selective solder
dissolve PCB pads.

How do you solder them into the circuit - could you take them untinned and
then let the solder process used to assemble them burn the lacquer off?

Regards,
Chris


-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of H. Molema
Sent: 19 June 2006 12:05
To: [log in to unmask]
Subject: [LF] Tin eating our copper wire

Hello all,

I have a question from our transformer factory they build transformers for
us with a Ø 0.019mm copper wire. They have done several lead free testing
but the have problems with the tin dissolving the thin copper wires.
The copper wires are soldered via a dipping method.
This the only component we can't get compliant yet for a specific board.
We are planning on doing a test with Sn/Bi but I would like to know if there
are any other alloys that we can use that will be hot enough to burn away
the coating of the copper wire but doesn't dissolve the wire.

Thanks,

Hilbrand

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