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Numerical simulation of high-efficiency welding process and subsequent heat treatment for reduction of residual stresses

Welding is used as primary joining technology in various industries like civil engineering, ship- building and heavy-duty machinery building, etc., where machine components of significant thickness need to be welded together. In recent times, many researchers and companies are trying to improve the efficiency of existing welding processes, which is mostly measured in higher deposition rate of molten metal per unit of time. After improving the efficiency of existing welding processes, is to achieve lower values of tensile residual stresses in the welded joint, or in other words to achieve the highest possible values of mechanical properties of the welded joint. Since lower values of residual stresses are hard to achieve without implementing welding in multiple passes, other procedures should be applied after the welding. The most common technology for reduction of residual stresses is post-weld heat treatment. In order to reduce the costs of the testing, the numerical models of heat treatment will be developed on the basis of obtained experimental data in order to examine each PWHT parameter in detail.

high-efficiency welding, residual stresses, heat-treatment, fracture-mechanics

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