Tunnel for fluxless soldering

Details Tunnel for fluxless soldering Tunnel for fluxless soldering

1989-12-08

1991-09-17

Heinrich, Samuel M.

Metal fusion bonding

Process

Plural joints

228220, 228262, 228 37, B23K 100, B23K 106, B23K 3538, H05K 334

Patent

active

050487469

ABSTRACT:
A tunnel for fluxless soldering, is a straight linear tunnel which contains vibrating means to vibrate a solder wave and a non-explosive gas atmosphere. The gas atmosphere includes a small portion of hydrogen or other gaseous reducing agent, sufficient to achieve a fluxing action. A process for soldering an element comprises the steps of conveying the element through a tunnel containing a non-explosive gas atmosphere substantially excluding oxygen, heating the element in the tunnel, soldering the element, and retaining the element in the gas atmosphere of the tunnel until solder on the element has solidified.

REFERENCES:
patent: 4538757 (1985-09-01), Bertiger
patent: 4580716 (1986-04-01), Barresi et al.
patent: 4600137 (1986-07-01), Comerford
patent: 4632291 (1986-12-01), Rahn et al.
patent: 4684056 (1987-08-01), Deambrosio
patent: 4726506 (1988-02-01), Kondo
patent: 4771929 (1988-09-01), Bahr et al.
patent: 4921156 (1990-05-01), Hohnerlein
Western Electric Technical Digest No. 44, "Tape Feed . . . Through an Ultrasonically Activated Solder Bath", pp. 45, 46, Oct. 1976.
Metals Handbook, Ninth Edition, vol. 6, "Furnace Brazing of Steels", pp.929-948, copyright 1983.
Nitrogenius 1, Hartmann, H. J., "Softsoldering Under Cover Gases", 11-1989.
Lenz, Von Eduard, Automatisiertes Loten Elektronischer Baugruppen, Siemens Aktiengesellschaft, 1985.

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