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    • 2. 发明授权
    • Method for vapor phase soldering
    • 气相焊接方法
    • US4840305A
    • 1989-06-20
    • US32426
    • 1987-03-30
    • Michael J. AnkromCorey H. BowcuttJohn J. Buckley, Jr.James A. Rew
    • Michael J. AnkromCorey H. BowcuttJohn J. Buckley, Jr.James A. Rew
    • B23K1/015B23K3/06H05K3/34
    • H05K3/3494B23K1/015B23K3/06H05K2203/088H05K2203/163H05K3/3489
    • A method for vapor phase soldering components onto a PWB onto which solder has been previously deposited includes the steps of applying a fluxing agent on the PWB and introducing the PWB into a vapor phase environment. The application of flux is a multi-step process which includes a sequential application of flux to the PWB. The vapor phase environment defines a temperature gradient between approximately ambient and the temperature of a saturated vapor of a first selected fluid which defines a primary saturated vapor phase with a boiling point which is greater than the melting point of solder. A second fluid having a boiling point which is lower than the first fluid is utilized to generate a secondary vapor blanket in order to prevent excessive loss of the fluid defining the primary vapor phase. The PWB is heated according to a controlled process in which the temperature of the PWB is continuously monitored.
    • 将预先沉积焊料的PWB上的气相成分焊接到PWB上的方法包括在PWB上施加助熔剂并将PWB引入气相环境的步骤。 助焊剂的应用是一个多步骤过程,其中包括向PWB顺序施加助焊剂。 气相环境限定了大约环境温度和第一选定流体的饱和蒸气的温度之间的温度梯度,该温度限定了沸点大于焊料熔点的初级饱和气相。 利用具有低于第一流体的沸点的第二流体来产生二次蒸气层,以防止限定初级气相的流体的过度损失。 PWB根据控制过程进行加热,其中PWB的温度连续监测。