کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
656380 1458042 2016 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A simplified elliptic paraboloid heat source model for autogenous GTAW process
ترجمه فارسی عنوان
مدل منبع حرارتی قطع مخروطی بیضوی ساده شده برای فرایند GTAW اتوژن
کلمات کلیدی
مدل سازی محاسباتی؛ روش حجم محدود. فرایند GTAW؛ منبع گرما؛ انتقال حرارت؛ جریان مایع
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی


• A novel volumetric heat source model for the GTAW process was proposed.
• The heat source model only requires the width and depth of the weld bead.
• The present model was solved by FEM, the results were validated experimentally.
• The molten metal was considered into the welding thermal field analysis.

The applicability of a welding process depends on the rate of heat input, which determines the residual stresses, the heat affected zone and the microstructural changes in the base material. An adequate approach of heat input through a heat source represents a crucial step in the welding thermal field simulation affecting the accuracy of mechanical and microstructural studies. This research work proposes a volumetric-moving heat source for the Gas Tungsten Arc Welding process (GTAW) based on an elliptic paraboloid geometry capable of representing shallow and deep, wide and narrow fusion zones, considering as shape parameters of the heat source, the fusion width and depth penetration. The interaction of the melting material flow in the weldpool and the heat transfer process were analyzed taking into account the effect of convective heat transfer in the heat input distribution in the fusion zone, and the weldpool shape variations during its displacement. The mathematical model for the GTAW thermal field was solved numerically by means of Finite Volume Method (FVM). The elliptic paraboloid model provided a comparable heat input to the classic double ellipsoid model. The estimated temperatures and the predicted geometry of cross-section weld bead by the proposed model are in a good agreement with experimental results.

Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 100, September 2016, Pages 536–549
نویسندگان
, , ,