Faster methods for estimating arc centre position during VAR and results from Ti-6Al-4V and INCONEL 718 alloys

International Symposium on Liquid Metal Processing & Casting 2015

材料科学;金属工艺学

Nair, B.G.^1 ; Winter, N.^2 ; Daniel, B.^3 ; Ward, R.M.^1

Metallurgy and Materials, University of Birmingham, Birmingham

B15 2TT, United Kingdom^1

Timet, Witton, Birmingham, United Kingdom^2

Special Metals, Hereford, United Kingdom^3

关键词: Aggressive environment;    Arc behaviour;    Direct measurement;    Experimental validations;    Inconel 718 alloy;    Magnetic sources;    Numerical validations;    Process parameters;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/143/1/012012/pdf
DOI  :  10.1088/1757-899X/143/1/012012

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Direct measurement of the flow of electric current during VAR is extremely difficult due to the aggressive environment as the arc process itself controls the distribution of current. In previous studies the technique of "magnetic source tomography" was presented; this was shown to be effective but it used a computationally intensive iterative method to analyse the distribution of arc centre position. In this paper we present faster computational methods requiring less numerical optimisation to determine the centre position of a single distributed arc both numerically and experimentally. Numerical validation of the algorithms were done on models and experimental validation on measurements based on titanium and nickel alloys (Ti6Al4V and INCONEL 718). The results are used to comment on the effects of process parameters on arc behaviour during VAR.