How to Use the Right Flux for the Selective Soldering Application

Published:

May 17, 2017

Author:

Bruno Tolla Ph.D, Denis Jean, Xiang Wei Ph.D

Abstract:

The selective soldering application requires a combination of performance attributes that traditional liquid fluxes designed for wave soldering applications cannot fulfill. First, the flux deposition on the board needs to be carefully controlled. Proper fine tuning of the flux physicochemical characteristics combined with a process optimization are mandatory to strike the right balance between solderability and reliability. However, localization of the flux residue through the drop jet process is not enough to guarantee the expected performance level. The flux needs to be designed to minimize the impact of unavoidable spreading and splashing events.

From this perspective a fundamental understanding of the relationships between formulation and reliability is critical. In this application, thermal history of the flux residues (from room temperature to solder liquidus) is a key performance driver. Finally, it is necessary to conduct statistically designed experiments on industrial selective soldering machines in order to map the relationships between flux characteristics and selective process friendliness....

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Company Information:

Kester

A leading global supplier of assembly materials to the electronic assembly, component and microelectronic marketplaces.

Itasca, Illinois, USA

Manufacturer of Assembly Material, Soldering

  • Phone +1 800.2.KESTER
  • Fax +1 630.616.4044

Kester website

Company Postings:

(5) products in the catalog

(15) technical library articles

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