Metal fusion bonding – Process – With protecting of work or filler or applying flux
Patent
1989-12-26
1991-06-18
Ramsey, Kenneth J.
Metal fusion bonding
Process
With protecting of work or filler or applying flux
228 46, 228 50, B23K 3704
Patent
active
050243713
ABSTRACT:
A process is described in which a weld in Aluminum alloy is produced without cracks and porosity; or, cracks and porosity is reduced to a low acceptable level. Thus, the process eliminates or reduces the need of non-destructive testing and re-work which usually involves gouging the defective area and re-welding to make the same sound and crack free. Porosity in the weld, however, can't be reduced once generated during solidification of the weld; therefore, cooling gradients are applied to the weld by placing a back-up material with sufficient heat-sink capacity and having thermal conductivity higher than the base metal/s, the back-up material having the same width which contacts the projected weld width on the opposite side of weld.
REFERENCES:
patent: 2280150 (1942-04-01), Hasse et al.
patent: 2357170 (1944-08-01), Burggraf
patent: 4360141 (1982-11-01), Kensrue
Nanjumdeswaran Welding and Metal Fabrication, Sep. 1982, p. 331.
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