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June 2011

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Subject:
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Brian Ellis <[log in to unmask]>
Date:
Wed, 1 Jun 2011 08:56:32 +0300
Content-Type:
text/plain
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text/plain (48 lines)
1. Flux residues between the wires above the tinned length or under 
insulation could cause corrosion
2. Under pressure from the crimp, the solder will cold-flow and will 
continue flowing for days, weeks and months to come. This may break the 
integrity of the electrical connection and it may even flow to where the 
metals are oxidised.

Brian

On 31/05/2011 20:24, Gregg Owens wrote:
> Dear Technetters:
>
> I have been posed a question I can't answer. In both the IPC-A-610 and IPC-A-620 require that stranded wires used for crimp connections NOT be pre-tinned with solder. Okay I get the requirement, but does anyone know why this is a requirement. Pre-tinning keeps the strands together, so there is some push-pack on why this is a requirement. Any thought appreciated.
>
> Gregg Owens
>
>
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