| 摘要 |
PURPOSE:To perform the soldering with excellent solderability even in a low temp. and high reliability by specifying the compsn. of a solder and making the ratio of the compsn. in a prescribed compsn. range. CONSTITUTION:The titled quaternary solder consists of, by wt., 40-70% Sn, 2-15% Bi, 5-15% In and the balance Pb with a melting point in the range of 100-160 C. Even electronic parts with inferior heat resistance can be soldered collectively by a dip system or a flow system and productivity and workability can be enhanced by forming such a compsn. |
