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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2012

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Controlling technology of Sn whisker in welding of electronics lead

Kubouchi T, Kamiya O, Sakakida T, Chida M, Nishikawa S

Journal of Achievements in Materials and Manufacturing Engineering

2012

Vol. 55, nr 2

727--733

This paper describes development for preventive technology of Sn whisker in welding of aluminum electrolytic condenser lead. Sn whisker is the crystal of tin and the length of Sn whisker is from several μm to several mm. Sn whisker has been causes for failure in electric device occasionally. The lead of aluminum electrolytic condense is composed of Sn and Cu plated Fe wire (named CP wire) and Al wire by Percussion welding. From observation, Sn whisker occurred from Al-Sn alloy area in welding point. We considered exclusion Sn from welding point. In this experiment, we used Sn plated-less CP wire with mold in welding. This mold is addition to chucking unit of welding machine. We obtained good shape and sufficient bonding strength by this method. There is no Sn whisker on the welding point after accelerated test during 4000hr.