Effect of Welding Parameters on Pitting Corrosion Rate in 3.5N NaCl of Pulsed Current Micro Plasma Arc Welded AISI 304L Sheets

Kondapalli Siva Prasad, Chalamalasetti Srinivasa Rao 1  and Damera Nageswara Rao 2
  • 1 Department of Mechanical Engineering, AU College of Engineering, Andhra University, Visakhapatnam, India
  • 2 Centurion University of Technology and Management, Odisha, India

Abstract

Austenitic stainless steel sheets have gathered wide acceptance in the fabrication of components, which require high temperature resistance and corrosion resistance, such as metal bellows used in expansion joints in aircraft, aerospace and petroleum industry. In case of single pass welding of thinner sections of this alloy, Pulsed Current Micro Plasma Arc Welding (PCMPAW) was found beneficial due to its advantages over the conventional continuous current process. This paper highlights the development of empirical mathematical equations using multiple regression analysis, correlating various process parameters to pitting corrosion rates in PCMPAW of AISI 304L sheets in 3.5 Normal NaCl. The experiments were conducted based on a five factor, five level central composite rotatable design matrix. The adequacy of the model is checked by Analysis of Variance (ANOVA). The main effects and interactions effects of the welding process parameters on pitting corrosion rates of the welded joints are studied using surface and contour plots.

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