Description: Low rosin flux-cored wire for lead-free no-clean flux and its preparation method, involving a flux. To provide a low rosin flux-cored lead-free no-clean flux and its preparation method to solve the lead-free welding fumes during welding large-odor, residue of many other issues. Components and content of rosin flux from 1% to 3%, an activator of 5% to 10% film-forming agent of 0.5% to 1.5%, 0.1% to 0.5% corrosion inhibitor, a surfactant, 0.1% to 0.3%, the balance of the solvent. Anhydrous ethanol, glycerol and ethylene glycol monobutyl ether were mixed to obtain a mixed solution; rosin in the mixed solution was added and the activator, heated until completely dissolved to obtain a solution A; solution A film-forming agent is added, the corrosion agents and surfactants, stirring until completely dissolved to give a solution B; solution B was cooled, filtered, that was used for low rosin flux-cored lead-free no-clean flux.Upon examination, the welding process less smoke, less residue, good wetting, solder plump and shiny, without cleaning after soldering, welding requirements to meet.
DOI: B23K35 / 362 (2006.01) I