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Article: Solderable coatings and Pb-free alloy combinations: the amount of each element can have wide bearing on joint properties.(Wave Soldering)
- Article from:
- Circuits Assembly
- Article date:
- December 1, 2006
- Author:
CopyrightCOPYRIGHT 2006 UP Media Group, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Many alloys can be used in Pb-free soldering. Most are developed for a specific process, such as reflow soldering. Apart from that, different component-lead coatings often have to be used in the assembly. Finally, the coating on the PCB affects joint formation. How can one be sure that they will work together in the assembly of a complex circuit board?
It is not easy to provide a perfect selection for all possible combinations. The point is that some element combinations in the solder or the solderable coatings will produce alloy traces in a joint that can have a relative, low melting point. These traces then can affect long-term joint reliability. This of course ...