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July 2009

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Wed, 15 Jul 2009 09:20:05 +0530
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Dear Mr.Werner,

They claim, they did bake it at 120degC for 2 hours before they were wave soldered. Will moisture affect solderability ? Can you kindly brief how. We were under the impression that it affects only the PTH reliability. 

regards

pradeep

Werner Engelmaier /* wrote at Wed Jul 15 01:25:30 GMT+05:30 2009:
> Hi Pradeep,
>Did they bake the moisture out of the PCBs prior to wave soldering?
>Werner
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>
>-----Original Message-----
>From: mp3 <[log in to unmask]>
>To: [log in to unmask]
>Sent: Tue, Jul 14, 2009 6:50 am
>Subject: [TN] Solderability
>
>
>
>
>
>
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>
>
>Hi,
>
>We are a PCB manufacturer and we had supplied some 2.4mm thick PCBs to one of 
>our customers who has complained regarding solderability issue. They say there 
>are having issues with respect to blowholes / pinholes after wavesoldering. We 
>had checked for solderability on the coupon and had ensured that everything is 
>acceptable prior to the despatch. We repeated the same after receipt of the 
>feedback and found the results to be OK. To simulate it, we sent a couple of 
>bare circuits to a 3rd party assembler and got it wave soldered. The hole 
>diameters are 2.55mm and 1.0mm . The photographs after wavesoldering trials are 
>attached. We find it to be quite OK. We feel that since there are no components, 
>and since the diameter is on the higher side, there will be a slight depression 
>at the centre. But the customer insists that the trial boards too have a 
>problem. Can you give a feedback on this after checking the attached 
>photographs. We were asking our customer to check on the parameters like fluxing 
>etc. And he says all are well in control. Any inputs to understand this issue 
>better.
>
>rgds
>
>pradeep
>
>
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>Micropack Ltd, Bangalore, India
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-------------------------------
Micropack Ltd, Bangalore, India

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