Mathematical Modelling of Weld Phenomena Series, Volume 3 by Horst Cerjak

By Horst Cerjak

Comprises the papers offered on the 3rd foreign assembly at the 'numerical research of weldability' organised by means of the overseas Institute of Welding and the dep. of fabrics technological know-how and Welding at Graz collage of know-how. The evolution in weld microstructure has been modelled utilizing mobile automata, which permit non-trivial procedures and styles to be computed beginning with easy deterministic principles. One paper describes a version which includes the impact of deformation on precipitation kinetics within the HAZ in the course of welding of cold-worked aluminium. For the 1st time there's a exact article at the precipitation of oxides from the liquid weld pool.

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Among the factors which affect the surface tension of the liquid metal in the weld pool, the role of surface-active substances has been investigated most extensively (see ref. 7 for a review). While additions of surface active elements like S, 0, Se, and Te generally lead to an increased weld-pool aspect ratio, elements like AI, Mn, Ce, and Ca generally decrease the aspect ratio. The surface tension of liquid metals at elevated temperatures is difficult to measure, and experimental data in the literature " show significant scatter.

T. 17. T. EL GAMMEL, B. YOSTOS 18. P. C. GUPTA: 'Nitrogen Absorption Rate under Plasma Arc Compared to Resistance and Induction Melting', lSI] International, 1994, 34(3), 295-297. 19. P. C. GUPTA: 'Fe-Cr Melt Nitrogenation when Exposed to Nitrogen Plasma', lSI] International, 1993,33(5),567-576. M. UDA and s. OHNO: 'Effect of Surface Active Elements on Nitrogen Content of Iron under Arc Melting', Trans. Nat. Res. Inst. , 1973, 15(1),20-28. M. UDA and s. OHNO: 'Spattering Phenomenon for Iron-Nitrogen System during Arc Melting', Trans.

ZHAI and A. HAUCK: 'Nitrogen Transfer into Plasma Heated Steel Melt as a Function of Arc Polarity', Steel Research, 1994, 65(6), 219-224. 20. 21. 22. 23. 24. 25. 26. 27. N. EL SABBAHY: 'Nitrogen Plasma Process', Steel Research, 1992,63(6),234-241. E. CROSS, H. HOFFMEISTER and G. HUISMANN: 'Nitrogen Control in Hyperbaric Welding of Duplex Stainless Steel', presented at International Institute of Welding Conference, Sweden, 1995. T. KUWANA and H. KOKAWA: 'The Nitrogen Absorption of Iron Weld Metal during Gas Tungsten Arc Welding', Trans.

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