Abstract
Prediction of the distortions and residual stresses of the welded steel structures is still very important to reduction of the costs, mainly during the optimization of welding process. If there is necessity of the higher welding current to ensure weld penetration, distortions might be influenced by appropriate welding sequence. During optimization process, numerical analysis of welding process, based on finite element method, can be used to prediction of distortions at different welding sequences without necessity of preparing high amount of experimental samples. Numerical simulation of T-joint welding process is presented in this article, together with verification of the analysis by thermocouple measurements and contactless measurement of distortions.
Highlights
Welding distortions in a structure or component can result in the degradation of its dimensional tolerances followed by costly rectifications and possible delays in the production line
Because the rate of heat generation due to mechanical dissipation energy can be neglected in the heat transfer analysis, a sequentially coupled thermal-stress analysis is commonly applied for the simulation of a welding process in which a thermal analysis is followed by a stress analysis [2 - 6]
Temperature cycles obtained by numerical simulation achieved high agreement with the experimentally determined curves
Summary
Welding distortions in a structure or component can result in the degradation of its dimensional tolerances followed by costly rectifications and possible delays in the production line. The FE simulations for the welding process can be divided into three categories, though they all have a common motive which is assessment of welding residual stresses and distortions. 3. The simulations in which FE input parameters (mesh size, element type, heat source model, material properties and material models etc.) are manipulated to study their influence on residual stresses and distortions [1]. A finite element simulation of the welding process consists of two main parts: thermal analysis and mechanical stress analysis. Because the rate of heat generation due to mechanical dissipation energy can be neglected in the heat transfer analysis, a sequentially coupled thermal-stress analysis is commonly applied for the simulation of a welding process in which a thermal analysis is followed by a stress analysis [2 - 6]
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