Metal fusion bonding – Process – Plural joints
Patent
1988-07-13
1989-07-18
Ramsey, Kenneth J.
Metal fusion bonding
Process
Plural joints
228259, 228 36, 228 40, 228 43, H05K 334, B23K 108
Patent
active
048486442
ABSTRACT:
The invention is an improved drag soldering machine for printed wiring boards (PWB) for providing a uniform vertical velocity at the point of separation between the solder and the PWBs. The improved drag soldering machine has a molten solder bath, an entry guide for directing the PWB to a horizontal position partially submerged in the solder bath, a drag guide for horizontally directing the PWB across the solder bath, an exit guide for separating the PWB from the solder bath by directing the PWB up and away from the solder bath and a transport means for advancing the PWB in the guide means, wherein the improvement comprises an exit guide providing an approximately uniform vertical velocity at the point of separation between the PWB and the solder bath thereby promoting a uniform soleder distribution over the length of the PWB.
REFERENCES:
patent: 3896921 (1975-07-01), Sund et al.
patent: 4285457 (1981-08-01), Kondo
patent: 4311266 (1982-01-01), Kondo
patent: 4512510 (1985-04-01), Kondo
patent: 4637541 (1987-01-01), Tanny
patent: 4685605 (1987-08-01), Spigarelli et al.
Heinrich Samuel M.
Ramsey Kenneth J.
Sutcliff W. G.
Westinghouse Electric Corp.
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