Abstract
The motivation of the paper is an attempt to indicate the relationship between the selected Gas Tungsten Arc Welding (GTAW) technology and the parameters of the boundary conditions for the simulation of the heat treatment process of elements made of medium-carbon steel. The authors of the paper prepared and described a series of numerical simulations and experimental studies concerning this problem. Simulations often use previously-developed analytical equations to describe the relationships between process parameters. The results obtained for the input data for determining the heat source power (voltage) from the analytical equation and experimental measurements were compared. Several cases of the size of the areas of direct influence of the GTAW arc (various radius of a simulation heat source) were analysed. All computations were performed in the author’s software based on Finite Element Method (FEM) solving the heat transfer equation with the convection term. In this paper, the GTAW heating parameters (boundary condition) for a current intensity equal 30 A were identified. With the assumed arc efficiency coefficient, the arc voltage set on the device and the measured value of the arc current, the optimum radius of the heat source was determined. The identification of parameters was confirmed by the convergence of the results of numerical simulation in three-dimensional space (3D) with the results of the experiment. Unfortunately, the applied methodology did not give good results for current equal to 50A.
Highlights
One of the most effective ways of joining metals is to use an electric arc
The paper focuses on the comparison of different radius of the heat source, arc voltage assumed from the literature and experimental dependencies and one value of the arc efficiency coefficient
In the studies conducted up to now, there are no comprehensive solutions for the conversion of Gas Tungsten Arc Welding (GTAW) heating conditions into parameters of a simulation heat source
Summary
One of the most effective ways of joining metals is to use an electric arc. Among the methods of welding metals, one of the best processes in terms of quality is the method of electric welding in shielding gases uses a non-consumable tungsten electrode (GTAW). We present the results of such calculations and their comparison with the results obtained on the research stand Another important problem is to determine the parameters of the boundary conditions that simulate the GTAW electrode and the cooling conditions. Artificial neural networks require immense training, testing and validation sets [8] In this example there is not enough experimental data for GTAW methods without remelting. The proper selection of heat source parameters during GTAW process requires verification of arc voltage, arc current and arc efficiency coefficient. The paper focuses on the comparison of different radius of the heat source, arc voltage assumed from the literature and experimental dependencies and one value of the arc efficiency coefficient. In the studies conducted up to now, there are no comprehensive solutions for the conversion of GTAW heating conditions into parameters of a simulation heat source
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