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Characteristics of press-soldered joints by using resistance heating

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3 Author(s)
Haramaki, T. ; Hitachi Ltd., Ibaraki, Japan ; Funamoto, T. ; Shida, T.

In order to increase the strengths of soldered joints, a novel press-soldering method was investigated. In this method, materials of low melting points and low strengths (mainly Pb) were discharged from the joint interface and an alloyed layer of high strength was left. Copper-to-copper lap joints were press-soldered using a resistance heating apparatus. In this process, heating and pressure were applied simultaneously. The copper plate was presoldered using Pb-50 Sn solder, and the alloyed layer was formed. The tensile strengths increased at a pressure above 45 N, and fracturing occurred in the copper base metal above a 75-N pressure load. The joints fractured in the copper base metal during the 150°C and 250°C tensile testing and showed excellent thermal resistance. Changes in joint strengths after high-temperature heating (150°C, 250°C, 1000 h) are also considered

Published in:

Components, Hybrids, and Manufacturing Technology, IEEE Transactions on  (Volume:13 ,  Issue: 2 )

Date of Publication:

Jun 1990

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