Repairing method with welding and build-up welding apparatus for

Details Repairing method with welding and build-up welding apparatus for Repairing method with welding and build-up welding apparatus for

1995-12-07

1997-08-12

Shaw, Clifford C.

Electric heating

Metal heating

For deposition welding

219137PS, 219137R, B23K 904

Patent

active

056561830

ABSTRACT:
A metal member, such as a metal mold, can be securely repaired by a welding machine and an arc melting machine. A proper volume of fine welding powder or a thin sheet-type welding material is provided on the portion of the metal member to be repaired. A primary electrode of the welding machine is pressed to a portion of the welding powder or the welding material. A large pulse current of 300-1500 amperes is applied to the primary electrode for a short period of 1/1000-4/1000 seconds to form dot-shaped welded metal nuggets on the metal member, which nuggets are made to couple or overlap continuously with other plural welded metal nuggets. Thus, a build-up welding with nuggets, lines of nuggets or layers of nuggets is established and the welded portion has a desired thickness in a desired area of the portion to be repaired. The build-up welded portion of the metal member to be repaired is enveloped in an inactive gas atmosphere. A primary electrode of the arc melting machine is positioned at a place adjacent to the build-up welded portion and the arc melting machine applies the arc to the build-up portion for a short period so as to melt the welded metal again. The excess build-up welded portion is removed after the build-up welded portion is solidified and the repair is finalized by grounding.

REFERENCES:
patent: 2592414 (1952-04-01), Gibson
patent: 2994762 (1961-08-01), Todd
patent: 3231430 (1966-01-01), Krieger et al.
patent: 4405851 (1983-09-01), Sheldon
patent: 4764654 (1988-08-01), Ady
patent: 5378867 (1995-01-01), Niinuma
patent: 5443201 (1995-08-01), Cartry

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