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

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Flux waves on PCBs

Views: 239

vb7007

#73660

Flux waves on PCBs | 10 March, 2015

Hi

I have been struggling with boards for high quality picky customer. I am getting flux waves (like splashed - too hard to clean) after wave, where as we are still using Kester 979 (No clean flux, but as we are getting visible marks which looks similar like dross with flux. I have attached images for reference. In image that's definitely not solder. Its flux and please suggest how to avoid this issue. I have tried changing, flux supply level / pre-heat temps / variant conveyor speeds / solder pot heights. But no luck.

For IMAGES : http://www.keepandshare.com/doc12/show.php?i=2595013

Please help me to solve this.

Thanks

reply »

vb7007

#73661

Flux waves on PCBs | 10 March, 2015

Hi

I have been struggling with boards for high quality picky customer. I am getting flux waves (like splashed - too hard to clean) after wave, where as we are still using Kester 979 (No clean flux, but as we are getting visible marks which looks similar like dross with flux. I have attached images for reference. In image that's definitely not solder. Its flux and please suggest how to avoid this issue. I have tried changing, flux supply level / pre-heat temps / variant conveyor speeds / solder pot heights. But no luck.

For IMAGES : http://www.keepandshare.com/doc12/show.php?i=2595013

Please help me to solve this.

Thanks

reply »

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