Title: Optimisation of welding parameters in pulsed MIG/MAG welding with width-controlled sine-wave current pulses. Part 1: Determination of a general synergic equation and a normalised parametric diagram with a defined parametric welding range

Authors: Danijel Langus, Viljem Kralj, Janez Grum

Addresses: Sempeterska 33, 4000 Kranj, Slovenia. ' Hrusevo 74, 1356 Dobrava, Slovenia. ' Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, 1000 Ljubljana, Slovenia

Abstract: The paper treats synergic pulsed MIG/MAG welding with width-controlled sine-wave current pulses. Such a current-pulse waveform will be obtained if a power source is controlled by thyristors integrated in a power circuit. In this case the pulse frequency is constant and the current-pulse power can be controlled by the delay time of the thyristor ignition. The paper focuses on a theoretical derivation of a general synergic equation of pulsed MIG/MAG welding with width-controlled sine-wave current pulses that relates a mean welding current with pulsed welding parameters. On this basis, a normalised parametric diagram with a defined parametric welding range can be defined and elaborated, which permits a further analysis of pulsed welding and optimisation of pulsed welding parameters.

Keywords: normalised diagram; parametric range; pulsed welding; sine-wave pulses; synergic equation; synergic welding; thyristorised power sources; optimisation; welding parameters; MIG/MAG welding; thyristors.

DOI: 10.1504/IJMPT.2007.013125

International Journal of Materials and Product Technology, 2007 Vol.29 No.1/2/3/4, pp.244 - 254

Published online: 09 Apr 2007 *

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