Determination of parameters affecting solder paste tack strength as measured in the ipc tack test: A classical design of experiments approach

Scott Anson, C. Sahay, Linda Head, James Constable

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Solder paste is used in the electronics industry to connect surface mount circuit components to printed wiring boards. A printed wire board (PWB) is populated with components by applying solder paste on the PWB, placing components and finally reflowing the solder paste in an oven. Between the time the component is placed on the PWB and the solder paste is reflowed, the components are to be held in position. This is helped by tackiness of the paste. The present paper describes an experimental investigation of the tack strength of three solder pastes with probe size, probe surface roughness, drying time, and surrounding pressure. The results indicate that the probe size has a significant and dominant effect on all the pastes examined. A mechanistic view of the possible mechanism for this phenomenon is also presented. Measured tack strength is shown not to be simple adhesion, but to include a vacuum under the test probe that increases tack strength (force per unit area) as probe size increases.

Original languageEnglish (US)
Pages (from-to)94-100
Number of pages7
JournalJournal of Electronic Packaging, Transactions of the ASME
Volume118
Issue number2
DOIs
StatePublished - Jun 1996

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials
  • Computer Science Applications
  • Electrical and Electronic Engineering

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