Patent ID: 6056189
Filing Date: 2000-05-02
Classification: B23K,H05K

Abstract:
A method for delivering a flux formulation without a surfactant for use in the assembly of electronic circuit boards as a no-clean formulation, comprising:preparing a flux solution having a fluxing agent consisting essentially of:one or more weak organic acids; anda solvent consisting essentially of water;the flux solution serving to transport the fluxing agent before deposition thereof upon a soldering site for reliability improvement engendered by a lack of hygroscopic residue and for avoidance of environmental degradation engendered by a lack of volatile organic chemicals (VOC's);heating the flux solution to create a heated flux solution and to increase the solubility of the one or more organic acids in the solvent, thereby diminishing the proportion of solvent needed to transport an effective amount of the fluxing agent and thereby diminishing hygroscopic residue remaining after soldering; andapplying the heated flux solution through a means of dispersion so that the flux solution is dispersed as fine particles.