《对接接头中I型坡口的焊接工艺及焊接变形研究》-毕业论文设计（学术).doc

PAGE II 对接接头中I型坡口的焊接工艺及焊接变形研究 摘 要 本文基于非线性有限元分析软件MSC.MARC平台，模拟了中碳钢5mm厚I型坡口平板对接焊，以及在不同焊接工艺参数下的温度场、应力场和焊接变形。利用MSC.MARC软件模拟焊接的基本过程如几何建模、参数设置、分析求解和结果输出等，分析平板在不同外部约束条件的温度场、应力场，并对比分析不同约束条件下的焊后残余应力及焊后变形，由此得出何种约束条件对I型坡口平板对接焊的变形和残余应力影响因素最小，从而指导实际工作。 关键词：焊接模拟，MSC.MARC，约束条件，残余应力，焊后变形 ABSTRACT Based on the nonlinear finite element analysis software MSC. MARC simulation platform, the article has simulated the joint of 5mm thick medium-carbon steel plate type, in different welding process parameters of the temperature field and stress field of the welding deformation and results. Using MSC. MARC software to simulate the basic process of welding simulation, such as geometry modeling generation, parameter settings and the results outputting and HYPERLINK app:ds:definite \t _self definitely analyzes the temperature field and stress field and the welding deformation in different constraint conditions, and finally concluded the effect of different constraint conditions on the type of welding deformation and residual stress influence, so as to guide the practical work. Keywords: Welding simulation, MSC. MARC, Constraint conditions, the residual stress, welding deformation. PAGE 11 目录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc263586015 第1章 概 论 PAGEREF _Toc263586015 \h 1 HYPERLINK \l _Toc263586016 1.1 课题背景及意义 PAGEREF _Toc263586016 \h 1 HYPERLINK \l _Toc263586017 1.2 焊接应力和焊接变形产生的原因 PAGEREF _Toc263586017 \h 1 HYPERLINK \l _Toc263586018 1.2.1焊接应力产生的原因 PAGEREF _Toc263586018 \h 1 HYPERLINK \l _Toc263586019 1.2.2焊接变形产生的原因 PAGEREF _Toc263586019 \h 1 HYPERLINK \l _Toc263586020 1.3 焊接模拟技术国内外现状及发展 PAGEREF _Toc263586020 \h 2 HYPERLINK \l _Toc263586021 1.3.1焊接模拟技术理论来源 PAGEREF _Toc263586021 \h 2 HYPERLINK \l _Toc263586022 1.3.2 焊接模拟技术发展现状 PAGEREF _Toc263586022 \h 3 HYPERLINK \l _Toc263586023 1.3.3 焊接模拟技术发展趋势 PAGEREF _Toc263586023 \h 3 HYPERLINK \l _Toc263586024 1.4 本文主要任务和研究路线 PAGEREF _Toc263586024 \h 4 HYPERLINK \l _Toc263586025 第2章MSC.MARC焊接模拟过程 PAGEREF _Toc263586025