Mechanical Properties Of The Thermal History

2006 Words9 Pages
During the welding process, Knowledge of temperature history in weldments is vital to the correct prediction of microstructure changes and consequently mechanical properties through knowledge of cooling rates and thermal gradients. Metal joining by submerged arc welding is a form of fusion welding that evolved with advancements in metal joining technology. It had been used for many years in the automotive industry for joining component parts. It is particularly well suited for uncoated, low carbon steel. Detailed thermal history within the fusion and heat-affected zones, including temperature distributions in welding are still subjects of modern research. Knowledge of the thermal history will considerably help in controlling
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To achieve this purpose a numerical computational model that can be applied to determine the temperature distributions with time along the weld plate length during and after welding operations at a given temperature under ambient and pre-heat conditions of the circular section is carried out using the explicit finite difference method. The computed transient temperature histories are hereby presented for different locations along the circular section and later compared with experimentally obtained values in order to validate the present simulation.

To achieve a high productivity, welding processes with large heat input such as submerged arc welding (SAW) are widely used in industries and constriction of different works. The large heat input will significantly change the microstructure and mechanical properties especially the grain size and toughness.
Welding processes depends on local heating of the welded parts up to melting temperature. Simulations of welding relays on the solution of heat transfer equations accompanied with the appropriate mechanical equations. These solutions started at the thirties of the twentieth century as analytical solutions [1]. After 30 years more accurate numerical solutions started to appear [2]. The evolution of these solutions was a direct result of the advances in computer speeds. Numerical methods include mostly two methods, finite element method (FEM)
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