Electric heating – Metal heating – Of cylinders
Patent
1976-06-25
1978-06-13
Grimley, Arthur T.
Electric heating
Metal heating
Of cylinders
21912512, 2191377, B23K 912
Patent
active
040950778
ABSTRACT:
A method and apparatus for preheating filler material to a temperature approaching its melting point prior to deposit within a weld zone. The weld zone and deposited filler material are then heated sufficiently to form an integral weldment. The power imparted to preheat the filler material is automatically, programmably, controlled as a predetermined function of the filler material deposition rate to obtain smooth melting of the filler material within the weld zone at any given filler material feed speed.
In an application to welding an extended seam along a workpiece wherein the weld zone is moved along the seam, the power employed to heat the weld zone and the filler material feed speed are additionally controlled as a function of the speed of movement of the weld zone along the seam.
In an application to welding generally cylindrical members along a designated circumferential weld seam, the method and apparatus of this invention simultaneously produce substantially identical welds at a plurality of spaced weld zones along the weld seam symmetrically situated about an axis bisecting the axis of revolution of the member by automatically controlling and establishing a substantially identical ratio of heat input to volume of deposited metal along the weld seam at each of the weld zones at any given point in time. Identical welds are achieved by automatically, programmably, controlling the power employed to preheat the filler material at each welding location as a function of the corresponding filler material feed speed and the respective feed speed and power imparted to each weld zone as a programmed function of the speed of the weld zone along the seam and the respective feed speed and welding power corresponding to each of the other weld zones along the seam.
REFERENCES:
patent: 3122629 (1964-02-01), Manz
patent: 3261960 (1966-07-01), Lehnert
patent: 3267251 (1966-08-01), Anderson
patent: 3483354 (1969-12-01), Manz et al.
patent: 3509314 (1970-04-01), Freytag
patent: 3555239 (1971-01-01), Kerth
patent: 3651290 (1972-03-01), Durbim et al.
patent: 3737614 (1973-06-01), Paulange
patent: 4019016 (1977-04-01), Friedman et al.
Schneider Urban A.
Sigman Robert D.
Abeles D. C.
Dermer Z. L.
Grimley Arthur T.
Shaw Clifford C.
Westinghouse Electric Corp.
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