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- W1327710 abstract "ABSTRACT The introduction, in the early 1960′s of pulsed current technology to gas metal arc welding expanded the potential use of this process especially for positional welding. Conventional equipment produces a pulsed current by using SCR circuitry to switch two constant potential sources between high and low current levels with the pulse frequency being a multiple of the line frequency (typically 60 Hz or 120 Hz). More recent approaches using transistor technology to obtain a pulsed GMAW process employ a method in which a wire feed speed measurement provides the necessary input to control the transistor switching frequency and consequently, the pulse frequency of the welding current output. This paper describes a technique developed at the Welding Institute of Canada whereby a transistor regulator converts a conventional DC constant potential output characteristic to a constant current characteristic which operates in a pulsed mode and has a variable frequency and does not require wire speed monitoring. This technique is seen to have advantages over currently available machines in its simplicity and flexibility of operation and in its precision in inducing a consistent metal transfer mode over a wide range of wire feed rates. The characteristics of the system, along with other perceived advantages over conventional equipment, are described together with recent industrial applications." @default.
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- W1327710 date "1986-01-01" @default.
- W1327710 modified "2023-09-23" @default.
- W1327710 title "PULSED FM-GMA WELDING" @default.
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- W1327710 doi "https://doi.org/10.1016/b978-0-08-031866-0.50007-x" @default.
- W1327710 hasPublicationYear "1986" @default.
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