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Preventing Pb-free solder pot contamination; Brittle joints are one common result of poor maintenance.(Wave Soldering)

Publication: Circuits Assembly
Publication Date: 01-JUL-08
Format: Online
Delivery: Immediate Online Access

Article Excerpt
Monitoring the composition of the alloy in the solder pot is critical to maintain a stable wave or selective soldering process. Deviation from the original composition of specified alloy results in physical property modification, such as melting behavior and intermetallics formation.

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...the typical wave or selective soldering process, the main elements of concern for Pb-free solder pot are copper, iron and lead. The copper percentage increases based on board and component types used. Copper levels above 1% potentially impact the stability of the process by affecting the melting point and encouraging [Cu.sub.6][Sn.sub.5] intermetallics...

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