Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Depanneling Problems

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#63782

Depanneling Problems | 17 February, 2011

We have a problems with soldering in the PCB in the Solder Wave process. Our pcbs are failures in the solder (voids) in the throughole components. The main problems is in varistor components. what are the soluctions to problems?

tks

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#63784

Depanneling Problems | 17 February, 2011

Humidity, Juliano? Try drying the boards pre solder; oven or dry storage cabinet.

If this works, Eureka has good desiccant dry storage cabinets, http://www.atekllc.com.

Shean Dalton www.fhpreps.com

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#63794

Depanneling Problems | 19 February, 2011

What kind of voids? There are voids from out gassing (moisture) and voids from contamination and or poor solder ability ? If it is on one component I would look at the part. Also if it a big Varistor make sure the board is preheated properly.

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#63856

Depanneling Problems | 2 March, 2011

Look at your fluxer as well (spray or foam?). You may not be getting ample flux over certain areas of the board. This can cause voids.

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#63857

Depanneling Problems | 2 March, 2011

I guess the problems are about humidity. How much time before production we need to store in Dry Unit? We have the SD532-31 SUPER DRY gabinet and we will use to store the PCBs. Thank you for your answer.

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