Development of New Solder Alloys for Automotive Application

Automotive radiators are currently used near their maximum operating capabilities. New temperature and pressure demands require stronger soldered joints to prevent failures. Quantitative data demonstrate a direct relation between soldering parameters and mechanical properties.

Several new solders and conventional alloys have been examined. Highest strengths are achieved with silver-bearing solders, especially at elevated temperatures. A new alloy, with 3.0-3.8 Sn, 1.2-1.5 Ag, balance Pb, showed 100% strength improvement, which should raise current reliability and make the soldered radiator viable at higher operating temperatures and pressures.