Download B0533 Mathematical modelling of weld phenomena by H. Cerjak, K. E. Easterling PDF

By H. Cerjak, K. E. Easterling

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Additional resources for B0533 Mathematical modelling of weld phenomena

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Examination of the results indicate that the calculated weld geometry using a constant negative dr/dT agrees best with the actual observations. CONCLUSIONS A computational modelling study was conducted to analyse the convective heat transfer that occurs during welding. The emphasis of the study was to verify the predictions of the computational model by comparing the simulations with the results of an experimental study. The results clearly showed that weld pool evaporation can significantly influence the development of the weld pool and must be included in the numerical and physical models that describe welding.

A radio frequency induction furnace was used as the po\ver source. The temperature of the droplet was controlled by adjusting the position of the droplet with 3 r-1l-U-1 \ 0_0 _0 _0 -------5 --r--==--~ 9 L _-----6 ~-----------------o 0 o 0 4 2 Figure 5. lv 1. Pyrometer 2. Optical window 3. Inlet 4. RF coil 5. Mullite tube 6. Graphite susceptor 7. Liquid droplet 8. Alumina substrate 9. Outlet set-up used for isotherm vaporisa- Mathematical Modelling a/Weld Phenomena 31 respect to the induction coil.

Our existing database of high temperature metals processing was developed, to a large extent, to understand the manufacturing and subsequent processing or use of metals and alloys. Unlike welding, these operations are seldom carried out at temperatures much above the melting points of metals. Furthermore, in most thermochemical processing, plasma is not present. 16-20 The uniqueness and complexity of the various physical phenomena in welding, the presence of plasma close to the weld pool surface, and the scarcity of the thermophysical data base at temperatures much higher than the melting point, often preclude meaningful comprehensive analysis of welding processes.

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