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| February 10, 2012
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Circulation Over 51,000
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April 7, 2010
Lead-free Assemblies Reworked with Leaded Solder
Can circuit board assemblies originally built using lead-free solder be reworked successfully using leaded solder?
I realize the assemblies may not comply with RoHS requirements, but will they be as reliable?
Do you have any general recommendations for changes to the rework process? Can you point to any industry specifications or documentation?
J. T.
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This is a very common situation. The most important thing is that you MUST remove all traces of the old lead free solder. I would wick, re-tin with leaded solder and wick again.
Once this is done then you can safely rework the area with leaded solder. Just be careful with all these heating operations and use a direct power soldering system, it will provide the maximum safety for your PCB assembly.
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Edward Zamborsky
Regional Sales Manager
OK International Inc.
Mr. Zamborsky serves as one of OK's technology advisers to the Product Development group. Ed has authored articles and papers on topics such as; Low Volume SMT Assembly, Solder Fume Extraction, SMT Rework, BGA Rework, Lead Free Hand Soldering, Lead Free Visual Inspection and Lead Free Array Rework.
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Unless you remove the major components of the No Lead solder, when you add the leaded solder, the chemical composition of the joint is variable and not know. I think you have to be eitherno lead or leaded.
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Steven Adamson
Market Specialist
Nordson ASYMTEK
Market Specialist for Nordson ASYMTEK. Mr. Adamson worked for Kodak, Motorola and Plessey, ICL in the UK with 5 US and 2 UK patents. He was awarded a HNC in electrical engineering and was 2008 President of IMAPS. Mr. Adamson was a respected mentor in the electronics industry. He passed away October, 2011. Learn about the Steve Adamson Memorial Annual Scholarship Fund.
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