Non-oxidizing soldering chamber with shaped curtain and method o

Details Non-oxidizing soldering chamber with shaped curtain and method o Non-oxidizing soldering chamber with shaped curtain and method o

1992-09-30

1994-06-14

Bradley, Paula A.

Metal fusion bonding

Including means to apply flux or filler to work or applicator

By partial or total immersion of work or applicator into liquid

2281801, 228219, 432250, B23K 300

Patent

active

053202740

ABSTRACT:
A soldering apparatus includes a conveyor adapted to carry assembled circuit boards through a soldering chamber. A wave of solder is created in the chamber. The chamber has a curtain at its entrance and a curtain at its exit. Gas distributors are located within the chamber and are able to introduce nitrogen into the chamber in order to create a non-oxidizing atmosphere in the vicinity of the wave. In operation, the wave of solder wets connecting points between the components and the board to form permanent joints on solidification of the solder. The bottom edge of the curtain is of a shape complementary to the front elevation of the assembled circuit boards to be soldered and is arranged such that the circuit boards just pass thereunder without making contact with it.

REFERENCES:
patent: 4580716 (1986-04-01), Barresi et al.
patent: 4838476 (1989-06-01), Rahn
patent: 4921156 (1990-05-01), Hohnerlein
patent: 5161727 (1992-11-01), Leturmy et al.
Patent Abstract of Japan, vol. 6, No. 26 (M-112) Feb. 16, 1982 & JP-A-56 144 860 (Fuji Electric Co Ltd) Apr. 14, 1980; "Conveyor Furnace".

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