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February 10, 2012
Solderability Problems at Low Humidity
Board Talk
Solder Deposits During Wave Soldering
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Design of New Solder Attach Technologies
Materials Tech
Problems Hand Soldering 24 Layer Board
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Nitrogen Inerting For Lead-Free Wave Soldering
Production Floor
Problems With Wave Solder Lead Bridging
Board Talk
Wave Soldering Problems
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Hand Soldering vs. Selective Wave
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Problems with Blow Holes
Ask the Experts
BGA Processing for Reliability
Production Floor
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Cause of Blow Holes During Wave Soldering
Cause of Blow Holes During Wave Soldering
What causes blow holes in tightly clinched radial lead LEDs? Why does loosening the clinch resolve the blow hole issue?
This program first published August 2009
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Comments  »
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We had a similar problem many years ago. A thru-hole crystal was coming out of the solder machine completely unsoldered. After a bit of thought, I tried bending the crystal a bit so it sat tilted on the board. Problem solved.

The crystal was providing a seal so the flux couldn't escape. That must've been causing a small gas bubble to form around the pad area and prevented solder from reaching the pad. We use a "dip" type solder machine made by Unit Design. That was really a fun puzzle to solve!


Patrick Muldoon, JPD Controls, Inc
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Cause of Blow Holes During Wave Soldering

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