Study on Weld Quality Characteristics of Pulsed Current Micro Plasma Arc Welding of Inconel625 Sheets

K. Siva Prasad, Ch.Srinivasa Rao, D.Nageswara Rao

Department of Mechanical Engineering, Andhra University, Visakhapatnam, INDIA.
Department of Mechanical Engineering, Anil Neerukonda Institute of Technology & Sciences, Visakhapatnam, INDIA.
Vice Chancellor, Centurion University, Orissa, INDIA.

DOI: 10.4236/jmmce.2012.112010                

Abstract

Nickel alloys had gathered wide acceptance in the fabrication of components which require high temperature resistance and corrosion resistance, such as metallic bellows used in expansion joints used in aircraft, aerospace and petroleum industry. In the present paper an attempt is made to study various weld quality characteristics like weld bead geometry dimensions, micro hardness, microstructure, grain size and tensile properties of Pulsed Current Micro Plasma Welding of Inconel625sheets. Weld joint was prepared by fusing the two parent metals of Inconel625 sheets. Square butt joint is used and welding was carried out using Pulsed DCEN, without filler wire. Peak current, back current, pulse and pulse width are considered as the main influential input variables during the welding.

Keywords

pulsed current, micro plasma arc welding, Inconel625, weld bead geometry, hardness, microstructure, grain size.

Conflicts of Interest

The authors declare no conflicts of interest.

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