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What Is Causing Blow Holes?
What could be causing blow holes on clinched radial lead components? The Assembly Brothers discuss this odd condition.
Phil Zarrow, ITM Consulting With over 35 years experience in PCB assembly, Phil is one of the leading experts in SMT process failure analysis. He has vast experience in SMT equipment, materials and processes.
Jim Hall, ITM Consulting A Lean Six-Sigma Master Blackbelt, Jim has a wealth of knowledge in soldering, thermal technology, equipment and process basics. He is a pioneer in the science of reflow.
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Be sure your PCB is free of moisture. Bad drilling and plating from the PCB manufacturer, combined with moisture will always lead to blowholes.
Benny Groenbjer, Grundfos, Denmark
We had the same blow holes problem and we deal with it by loosing the clinch. Due to this we solve the blow holes problem but some of the PCB arrive to wave soldering process with missing components. At the end we redesign the component.
How about high temp solder, such as SN5 (5% tin, 95% lead. If it does not melt in the solder wave, because it is "hi-temp" and not meant to melt, will it contaminate a lead-free pot when using it to attach a profile T/C? Or, is it just too risky? Is it "OK" if you only attach T/C on the top and none on the bottom using Hi-Temp lead lead solder?
Sunstone Circuits, has released the newest version of their design software, PCB123. Bottom line, the design process just got easier. Sunstone Circuits
Cognex® upward-looking & flying vision for placement of 01005s to large 150 x 100mm · Ball-screw drive w/ high-speed servo motor w/ linear encoders · Exceptional value · MC-385V1V Manncorp
Components encapsulated in plastic or organic compounds are susceptible to moisture damage. So are PCBs, all can cause early field failures. Control MSDs per IPC J-Std-033b.1 and 1601. Super Dry®
Engineering changes are a reality that need to be dealt with. Do you have qualified rework technicians to do the job efficiently and reliably? Circuit Technology Center
Sunstone Circuits, has released the newest version of their design software, PCB123. Bottom line, the design process just got easier. Sunstone Circuits
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Benny Groenbjer, Grundfos, Denmark
See http://www.circuitmart.com/pdf/what_is_causing_blow_holes.pdf
Nuno Sousa
Paul Austen