نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه فرایندهای ساخت- دانشکده مهندسی مواد و متالورژی-دانشگاه صنعتی امیرکبیر
2 دانشکده مهندسی مواد و متالورژی، دانشگاه صعنتی امیرکبیر، تهران، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Electroslag welding is a method of joining thick parts that has a higher input heat than other welding processes. This feature causes dramatic changes in microstructure and mechanical properties, especially grain size and toughness. Therefore, these joints are very vulnerable when subjected to dynamic loads. Considering the mentioned importance, in this research, a finite element model is first presented to solve the problem of heat transfer during electroslag welding. Due to the complexities of the process, most of the simulation was written with the special language of ANSYS software,. In the finite element model, the heat source is assumed as a volumetric heat flux with uniform density, and by considering plane symmetry and modeling half of the welding sample, the heat transfer problem was solved numerically. Then, the accuracy of the mentioned model was measured with the help of experimental tests and evaluation of the size of the weld pool, and in the next step, the validated model was used to check the thermal behavior of the system and the way of temperature distribution as a function of the variables of current intensity, voltage and welding speed. The finite element model correctly shows the relationship between input heat, process variables, material properties and slag temperature. Also, the comparison of the modeled and actual weld pool dimensions shows that the maximum difference is less than 13%.
کلیدواژهها [English]
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