Title: Development of a regression model relating experimentally measured arc parameters and gas tungsten arc welding process variables

Authors: Sanjivi Arul; R. Sellamuthu

Addresses: Department of Mechanical Engineering, Amrita Vishwa Vidyapeetham (Amrita University), Coimbatore – 641 112, Tamilnadu, India ' Department of Mechanical Engineering, Amrita Vishwa Vidyapeetham (Amrita University), Coimbatore – 641 112, Tamilnadu, India

Abstract: In order to solve the heat transfer model of GTA welding process, the physical and the thermal properties of the workpiece, the heat source efficiency and the area of heat incident on the workpiece surface are required. In this work, the arc dimensions were measured experimentally with respect to current, speed, electrode tip angle and electrode distance for autogenous GTA welding. The arc parameters were fitted against welding variables using regression analysis. The projected arc area is found to increase with current and electrode distance and to decrease with electrode tip angle whereas it is found to be independent of speed. The shape of the projected arc area is observed to be semi-circular in the front and semi-elliptical in the rear for moving heat source. The regression equation developed can be readily applied in estimating the area of heat incident for solving the heat transfer equation.

Keywords: gas tungsten arc welding; GTAW; numerical simulation; heat distribution; arc parameters; electrode distance; electrode tip angle; welding current; welding speed; regression analysis; computational materials science; surface engineering; heat transfer; modelling; GTA welding; process variables.

DOI: 10.1504/IJCMSSE.2013.053203

International Journal of Computational Materials Science and Surface Engineering, 2013 Vol.5 No.2, pp.177 - 188

Received: 12 Apr 2012
Accepted: 30 Nov 2012
Published online: 21 Jun 2014 *

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