Fluid flow & solidification in melt pool during arc welding of steel

A lecture by Professor Hongbiao Dong of Leicester University, focusing on the weld pool during the arc welding of steels. The lecture is a part of a series held at Warwick University's WMG Group. The talk features the physics and metallurgy of welding, computational thermodynamics, phase field methods, computational fluid dynamics and other mathematical modelling. Abstract: Welding is the most economical and effective way to join metals permanently, and it is a vital component of our manufacturing economy. In welding, work-pieces are mixed with filler materials and molten, to form a pool of metal that upon solidification becomes a strong, permanent joint. In this talk, I will briefly introduce principal phenomena occurring at three significant length scales (a) macro-scale, (b) meso-scale and (c) micro/nano-scale during arc welding, and then to talk about our experimentally observed internal fluid flow in the melt pool, followed by the solidification modelling to illustrate the grain structure evolution. https://www.phase-trans.msm.cam.ac.uk/