| 摘要 |
PROBLEM TO BE SOLVED: To provide a soldering method of a VPS(vapor phase soldering) system with the aim of mass production using tin - zinc based lead free solder thereby to realize electronic equipment having a long service life. SOLUTION: An inert liquid 2 having a known boiling point temperature higher than the melting point of solder by about 10 deg.C is evaporated, and the concentration of oxygen in the vapor atmosphere 2a is controlled to <=300 ppm, and reflow soldering is performed.
|
