Solder balls on pcb after using a stencil

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djoshi
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Posted by djoshi: Mon. Aug 31, 2020 - 08:05 PM
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Hi All

 

I have stencil for my PCB, but on certain places, there are small solder balls generating. Does this indicate that i need to reduce the thickness and aperture of my stencil pads?

 

 

Thanks

Regards

DJ

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Learning and Information, General Electronics
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N.Winterbottom
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Posted by N.Winterbottom: Mon. Aug 31, 2020 - 08:21 PM
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I thought that was caused by the paste having absorbed too much water vapour.

 

I did once find an excellent site that detailed common soldering faults, the causes and steps for prevention.

 

I cant find it now, it's gone from my history and I didn't bookmark it - Bugger.

 

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djoshi
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Posted by djoshi: Mon. Aug 31, 2020 - 09:33 PM
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Maybe that could be the reason.

 

I am new to stencil usage.

 

 

Thanks

Regards

DJ

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Chuck99
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Posted by Chuck99: Mon. Aug 31, 2020 - 10:02 PM
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djoshi wrote:
I have stencil for my PCB, but on certain places, there are small solder balls generating.

 

Take a look at:   "How to Prevent Solder Ball and Bridging Defects during the SMT Reflow Process"

 

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