ENHANCED PERFORMANCES OF HIGH FREQUENCY PULSED DIRECT CURRENTSHIELDED METAL ARC WELDING

Buddhadev Bagchi

Abstract: In practice the pulsedDirect Current (DC) welding is associated with Tungsten Inert GasArc welding process. This paper presents a novel Direct Current Arc Welding Technology named as High Frequency Pulsed Direct Current Shielded Metal Arc Welding (HF Pulsed DC SMAW) in whichthe square pulsed Direct Current superimposed by the high frequency Alternating Current is developed for welding any metal joint. This specialized Direct Current Arc Welding Technology uses one High Frequency Unit (HF) and one half-wave rectifier (Pulsar) with conventional welding machine. The performances of this technology have beeninvestigated and compared with the conventional Steady Direct Current Shielded Metal Arc Welding (DCSMAW) technology for the study on energy consumption, thermal gradient, heat input, metallurgical characteristics, weld quality and consumption of filler metal. HF Pulsed DC SMAW technology has been found superior to the conventional steady DC SMAW technology in respect toall the above parameters. Accordingly, instead of using steady DC SMAW technology, the HF Pulsed DC SMAW can be commercially used for any metal fabrication, manufacturing and maintenance of pressure vessels & pressure parts and any other applications.

Keywords: Welding, Direct Current, High Frequency, Pulsed

DOI: https://doi.org/10.15623/ijret.2013.0212123