ANALYSIS OF WETTING AND TENSILE STRENGTH OF SOLDER ALLOYSAuthors: Mark T. McMeen and Jason B. Gjesvold
Company: Soldering Technology Intn'l.
Date Published: 2/18/2003 Conference: Pan Pacific Symposium
The question asked by reliability and process engineers is which lead free solder alloys should I use in which flux configuration and is there a difference in performance between flux types and vendor brands. To answer these questions and understand the difference in tensile strength between 63/37 and lead free solder alloys, the following test protocol was created to correlate tensile strength to wetting angle via wetting force capability (Capillary Attraction).
This unusual comparison of tensile strength and wetting force capability has a defined objective to correlate wetting angle and wetting force (capillary attraction) to overall tensile strength of a solder joint by correlating common measure points from different solder alloys and their specific flux configuration. This solder joint or interconnection and its corresponding wetting force capability have a direct correlation to mechanical strength and integrity.
Key words: tensile testing, meniscograph, wetting force, capillary attraction, lead-free solder alloys, tin lead solder alloys and flux configurations.
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