Numerical prediction and mitigation of out-of-plane welding distortion in ship panel structure by elastic FE analysis

As an application to predict and mitigate the out-of-plane welding distortion by elastic FE analysis based on the inherent deformation theory, a panel structure of a pure car carrier ship is considered. The inherent deformations of different types of welded joints included in this ship panel structure are evaluated beforehand using thermal elastic plastic FE analysis. Applying idealized boundary condition to focus on the local deformation, elastic FE analysis shows that the considered ship panel structure will buckle near the edge and only bending distortion is dominant in the internal region. In order to mitigate out-of-plane welding distortion such as buckling and bending, straightening using line heating is employed. In the internal region, only inherent bending with the same magnitude as welding induced inherent bending is applied on the opposite side of welded joints (fast moving torch). On the other hand, only in-plane inherent strain produced by line heating is introduced to the edge region to correct buckling distortion (slow moving torch). The magnitude of out-of-plane welding distortion in this ship panel structure can be minimized to an accepted level.     

一体式热成型激光拼焊门环在汽车上的应用

运用新的工艺技术是轻量化的重要手段之一。本文简述了一体式热成型激光拼焊门环在某车型上的成形工艺和具体应用,并校核了门环的强度。门环成形运用了热成型激光拼焊技术,在生产上节约了模具设计及制造成本,而且实现了轻量化,门环减重超过10%。     

基于双面双弧焊接工艺的焊接接头残余应力及变形分析

本文采用数值模拟手段和小孔法测试试验,对新型双面双弧焊接工艺和现行单弧焊接工艺下船体高强度钢对接接头焊接过程及焊后残余应力、变形进行对比分析,为双面双弧焊接的实际应用及大面积推广奠定工艺基础。     

船用氮气储存罐的筒体和封头焊接工艺分析

Q345R钢是普通低合金高强度钢,广泛的用于压力容器制造行业。其S、P含量控制较严,焊接性较好,但是由于含有一定量的合金元素,淬硬、冷裂倾向都比低碳钢大一些。通过船用氮气储存罐的筒体和封头环焊缝的焊接,分析了Q345R钢的化学成分和机械性能,通过选用合理的焊接材料、坡口形式、焊接方法、焊接工艺来保证储存罐的焊缝质量。     

新型立式铝-钢复合接头焊后性能实验研究

本文通过对新型立式铝—钢复合接头焊接后的抗拉强度、疲劳性能、抗冲击性能等实验研究，得出了新型立式铝—钢复合接头焊接后在力学性能上满足工程应用要求的结论。     

基于MS-Project的规范化焊装项目管理

针对目前焊装规划项目管理存在的任务涉及面广、参与人员多、周期长、投资大等问题,基于项目管理理论和项目管理软件MS-Project,结合某企业焊装规划的实际项目经验,建立了标准化全流程焊装项目管理系统。该焊装规划项目管理系统避免了传统师徒制经验式的项目管理方式存在的不足,提升了企业的焊装自主规划能力,满足了科学化的焊装规划发展要求。     

四轮转向电动汽车车架的设计与有限元分析

现有电动汽车底盘普遍为在传统汽车的基础上进行的改进,不能很好的适应电动汽车特有的结构,为更好的实现四轮转向的功能,重新设计了适合四轮转向电动汽车的车架。应用三维软件SolidWorks,通过整车虚拟装配确定了合理的四轮转向电动汽车的车架结构,进而建立了车架的三维模型。运用有限元分析理论,将模型导入Ansys Workbench软件后,建立了车架的有限元模型,对车架在弯曲和扭转工况下的静态结构性能进行了分析,得出相应工况下的应力和应变大小;还进行了模态分析,避免了共振。在满足强度和刚度的条件下对车架结构进行了改进,并通过焊接加工得到了适合四轮转向电动汽车的车架,对以后电动汽车底盘的改进设计提供了参考。     

短周期拉弧式螺柱焊的应用

对影响短周期拉弧式螺柱焊焊接质量的几项因素进行分析,结合车身焊装车间两种常用螺柱焊接产品,归纳总结几项主要参数调整规范及两种焊接产品的优劣。     

Experimental and numerical investigation on welding simulation of long stiffened steel plate specimen

The paper presents the results of metal inert gas T-joint fillet welding tests of small scale rectangular stiffened steel plates longer than the standard test specimen. In the literature the focus is typically on plates with a small aspect ratio and the present work deals with plates of higher aspect ratio, which are the typical ones in marine structures, aiming to determine if there is any significant effect of welding along the longitudinal direction. Nonlinear thermo-elasto-plastic finite element models are adopted to evaluate the temperature distribution, welding induced distortions and residual stress in the stiffened plates of shipbuilding steel. Given the difficulty in data acquisition of temperature-dependent properties of the material, a simplified model of the properties is proposed, based on the values at room temperature. Good agreement is observed between the measured and simulated temperatures, indicating that the current finite element approach is appropriate to simulate the welding process. The proposed simplified material model can be efficiently used in the finite element analysis of welded steel structures. It is concluded that the welding parameters have more significant influence on the structural responses than the dimension of the plate.     

汽车焊接质量检查数字化研究

文章介绍了汽车焊接质量检查数字化的研究方案、数字化监控的网络架构、技术的创新及难点、实现的功能等。焊接质量检查数字化研究能在焊接质量检查方面达到高效、快捷、智能的目的;通过网络技术、大数据以及工业互联网技术等技术搭建焊接质量检查数字化平台;焊接质量检查员工通过此平台能够便捷输入、智能查询,得到焊接质量大数据,分析提升焊接质量;结合先进的智能制造技术,对实际焊接质量检查数字化进行研究,从大数据的角度加强对焊接质量问题的汇总分析和问题解决,提升汽车整体的焊接质量和智能制造能力。