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Ask the Experts | |||||||
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November 24, 2008 - Updated November 24, 2008 - Originally Posted Define Blow HolesBlow-holes seems to be a daily occurrence in our wave soldering process. Is this a defect? What is the root cause and how can we prevent it? C. T. |
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Expert Panel Responses | |||||||
Yes blow-holes are a defect for class 2 & 3 but not for class 1.
Senior Applications Engineer Speedline Technologies Greg joined Electrovert in February 1984. Based out of the Electrovert applications laboratory in Camdenton Missouri, Greg has been in the process applications support role since 2000. His primary responsibilities include providing process and machine applications support for the wave soldering lines as well as process, machine and operations training. He also provides applications support for the reflow and cleaner lines. Greg is a PBET certified trainer and holds two patents on wave solder nozzle design.
Blow holes are typically caused by moisture or an organic material trapped in the bare PCB that volatilizes rapidly when the board contacts the wave. The escaping gaseous materials will blow the molten metal out forming a void in the solder joint. Baking the PCBs is an option to remove entrapped moisture. Technical Manager - Europe Indium Corp. Currently with Indium Corporation and responsible for technology programs and technical support for customers in Europe. Over 15 yrs experience in SMT, Power, Thermal & Semiconductor Applications. Masters Degree in Industrial Engg, State University of New York-Binghamton.
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