Process and device for soldering electronic boards, in particula

Details Process and device for soldering electronic boards, in particula Process and device for soldering electronic boards, in particula

1991-12-18

1993-03-16

Seidel, Richard K.

Metal fusion bonding

Process

With pretreating other than heating or cooling of work part...

228206, 134 19, 134 31, B23K 120, B08B 700

Patent

active

051937395

ABSTRACT:
In the process according to the invention for soldering electronic boards, in particular, printed circuit boards with devices installed on them, first, during the pickling process, a condensable process material, for example, water, is introduced into flaws in the oxide layers on the soldering connection surfaces and at least partially condensed in the flaws. Then, the oxide layers are exposed to rapid heating such that the process material condensed in the flaws vaporizes explosively and thus the oxide layer breaks up and cracks off of the basis material, such that the soldering connection surfaces for the subsequent actual soldering process are brought to virgin condition. In the case of wave soldering, the rapid heating occurs preferably by means of the wave of solder itself. If non-oxide passive layers must also be removed, this occurs preferably in a preceding stage of the pickling process, during which the oxide layer is hydrophilized. For this, a plasma pretreatment is suitable. The device according to the invention has a moisturizing chamber in which the condensable process material is supplied to the hydrophilic oxide layers and absorbed by them.

REFERENCES:
patent: 2136392 (1938-11-01), Murphy
patent: 3484288 (1969-12-01), Niedner et al.
patent: 4986463 (1991-01-01), Zimmer

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