Spray a little flux on the first side when running the second side?

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ed Popielarski
Sent: Friday, May 08, 2015 1:08 PM
To: [log in to unmask]
Subject: [TN] Dpak outgassing second pass

Greetings fellow Technoids,

An interesting debacle arose, and I'm unsure if there is a solution.

Dpak components on side 1 solder fine, <25% voids, 100% edge wetting.

On 2nd pass (top side, big heavy components) the Dpaks on side 1 outgas and
exceed 25% (not a spec, just a target) but violate edge wetting (S/B 100%)
as the outgas tends to blow out the edge somewhere.

Any suggestion on how to eliminate this phenomena? Parts cannot be relocated
due to aerospace re-qual cost.

Thanks in advance!


Ed Popielarski
Engineering Manager

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