Electronics Forum: blowholes (Page 1 of 8)

blowholes in SMT process

Electronics Forum | Fri Mar 20 05:07:16 EDT 2009 | rocko

Hi All, I was puzzled because of terrible blowholes in solder joints of gold plated odd-form components. I am very confused because all other components on the boards have perfect solder joints. Here are some process details: 1) Solder paste: N

blowholes in SMT process

Electronics Forum | Sat Mar 21 09:09:40 EDT 2009 | davef

Your puzzlement about blowholes in PTH solder connections during reflow soldering comes from: * Boards are hydroscopic. So, moisture content of the board is uniform. * Gold plating is uniform. * Nickle plating is uniform. * Copper plating on your PTH

Right angle PTH lead profile = blowholes

Electronics Forum | Sat Jan 19 10:58:23 EST 2008 | slthomas

That's a good idea. We did pull the bridge piece off of one just to see what happens with the receptacles only, so no flux blockage. They flowed great with no blowholes, but also filled with solder. :/

Right angle PTH lead profile = blowholes

Electronics Forum | Thu Jan 17 22:37:43 EST 2008 | davef

Have you tried waving the board rotated 90* from the normal orientation?

Right angle PTH lead profile = blowholes

Electronics Forum | Fri Jan 18 09:34:06 EST 2008 | realchunks

Try lifting the part with a small piece of paper. I've seen caps that did this and giving the flux a way to vent out the top side of the board got rid of the blow holes. It'll take ya 2 seconds to to try - that plus the 3 minutes to wave solder.

Right angle PTH lead profile = blowholes

Electronics Forum | Sat Jan 19 10:56:26 EST 2008 | slthomas

Dave that's actually what I want to work on the next time we run these. Our issue with these right now is that weight distribution on the boards mandates that we break a 4-up panel into two pieces and run it 90 degrees to the ideal orientation (=s wh

Right angle PTH lead profile = blowholes

Electronics Forum | Wed Jan 16 14:46:38 EST 2008 | slthomas

We've got an auto fuse clip (a pair of tin/nickle spade type receptacles joined with a nylon bridge piece) giving us fits. The pins on this thing have a right angle profile (symmetrical "L" shape) and make great flux traps. No amount of tweaking pre

Blowholes during wave soldering

Electronics Forum | Mon Sep 10 11:13:47 EDT 2007 | russ

Aren't the solder balls a result of the blowholes? you know the solder that came from the blowholes is now the solderballs on the resist! hahaha :-) Russ

Blowholes during wave soldering

Electronics Forum | Wed Aug 29 02:21:42 EDT 2007 | jgrootkoerkamp

It is a lead free process with sac305. We use goldfinish FR4 boards. Preheat is between 110 and 115 degrees. I am sure it is a moisture problem because longer stored boards have more blowholes. What is the maxium period to store the boards without

Blowholes during wave soldering

Electronics Forum | Tue Aug 28 07:36:25 EDT 2007 | davef

If the copper on your PTH is not one thou, you will get blowholes. With the cost of copper going through the ceiling, you will get less than one thou of copper plating from substandard suppliers. Consider baking your boards prior to wave soldering

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