The effect of the cathode tip angle on the GTAW arc and weld pool: I. Mathematical model of the arc
- 7 October 1997
- journal article
- Published by IOP Publishing in Journal of Physics D: Applied Physics
- Vol. 30 (19), 2744-2756
- https://doi.org/10.1088/0022-3727/30/19/013
Abstract
By developing mathematical models for the arc and the weld pool in the GTAW process, the effect of the electrode tip angle on both arc and weld pool was studied. The present paper is concerned with the model for the arc. By applying a variable cathode surface area, the effect of the electrode tip angle (in the range of 10 to ) on the arc properties, especially on the anode current density, heat flux and gas shear stress over the weld pool, was investigated. Comparison of the calculated results with the available experimental data for 200 A arcs of different lengths showed that the model predictions for temperatures higher than 10 000 K are in very good agreement. For temperatures less than 10 000 K, some modifications were necessary to take into account the absorption of heat by the cooler parts of the arc. It was found that by increasing the electrode tip angle, the anode spot at the weld pool surface tended to be more localized. This led to a higher maximum heat flux and anode current density. On the other hand, the gas shear stress increased on decreasing the electrode tip angle.This publication has 20 references indexed in Scilit:
- Heat transfer and fluid flow in welding arcs produced by sharpened and flat electrodesInternational Journal of Heat and Mass Transfer, 1990
- MODELLING OF HIGH INTENSITY ARCS INCLUDING A NON-EQUILIBRIUM DESCRIPTION OF THE CATHODE SHEATHLe Journal de Physique Colloques, 1990
- A Study on Heat and Mass flow in Stationary Gas Tungsten arc Welding using the Numerical Mapping MethodProceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 1989
- Three-dimensional transient model for arc welding processMetallurgical Transactions B, 1989
- Thermal-Fluid Model for Weld Pool Geometry DynamicsJournal of Dynamic Systems, Measurement, and Control, 1989
- Fluid flow and weld penetration in stationary arc weldsMetallurgical Transactions A, 1985
- Two-dimensional analysis of free burning arcs in argonJournal of Physics D: Applied Physics, 1985
- Heat- and fluid-flow phenomena in weld poolsJournal of Fluid Mechanics, 1984
- Two-temperature modeling of the free-burning, high-intensity arcJournal of Applied Physics, 1983
- Study of the free-burning high-intensity argon arcJournal of Applied Physics, 1983