Soldering method

Abstract

Abstract PURPOSE: To prevent poor quality of soldering by holding the composition of melted solder within a certain range based on the difference in comparison of the wetness of melted solder with the standard characteristics after it is measured. CONSTITUTION: A standard test piece 4 hangs with a hanger 9 of a senser 5 and immersed into a melted solder 3 with a given composition. The standard characteristics of the wetness is plotted in a chart. From the wetness characteristics on the chart, determined are a shift time T during which the thrusting force of the test piece 4 decreases due to insufficient wetness leading to the generation of sucking force accompanied by wetting, and a limit level to which no poor soldering occurs at a saturation value H of sucking force due to wetting. Then, in the actual soldering work, wetness is measured from the values of T and H. The measured value is compared with the limit value for T and H. Based on the difference, the composition of the solder is maintained constant thereby preventing poor soldering. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Mitsuo Shirata
• 👤 Toshihiro Shima
• 👤 Yoichiro Maehara
• 👤 Akira Suzuki

Bibliographic Details