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。     

汽车焊装线设计的标准化管理

为提高汽车焊装线设计生产效率、缩短设计与制造周期、减少设计失误、降低生产成本，本文提出了知识共享的标准化管理方法。该标准化管理方法是增强竞争力的有效支点，在实际应用中将发挥出重要作用。     

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.     

A simplified non-linear numerical method for the assessment of welding induced deformations

Welding numerical simulation has always been a formidable challenge because of the involved complex phenomena to be modelled. The task is increasingly challenging when multi-runs welding or welding of ships is needed to be modelled. In these cases, the computational effort is so high that solving the problem via computational welding mechanics is impossible so far. Alternatively, different simplified numerical strategies were developed to overcome this issue such as those based on the inherent strain. Unfortunately, such numerical models are rarely able to capture the effects induced by a variation of the welding sequence or clamping conditions since they are solved in the elastic filed; most of them are therefore not useful to the design optimization of a welded assembly. In this scenario, a new approach is proposed to quantify the welding induced deformations that uses virtual elements to model the weld bead in the elastic-plastic filed and auxiliary elements to apply equivalent loads determined by experiments on a single welded joint. A specific inverse analysis algorithm has been developed to use the method. The model was applied to a real welded assembly in which both the welding sequence and clamping condition were varied. In addition, for the numerical validation, a novel registration algorithm has been developed to move from solid geometries to middle plane representations. Numerical results were found in good agreement with those obtained by experiments even when the welding sequence and clamping conditions are changed.     

铁道行业标准《铁道车辆用耐大气腐蚀钢及不锈钢焊接材料》修订简介

TB/T2374—1999《铁道机车车辆用耐候钢焊条和焊丝》的内容已不能满足规范铁道车辆车体用钢焊接材料的需要,需要对其进行修订。TB/T2374—2008《铁道车辆用耐大气腐蚀钢及不锈钢焊接材料》代替了TB/T2374—1999,增加高强度耐大气腐蚀钢焊接材料及铁路货车车体用不锈钢气体保护焊丝的相关内容,取消部分小用量焊材,提高熔敷金属冲击功的指标,对J506NiCrCu焊条化学成分进行适当调整,取消熔敷金属横向冷弯性能要求和焊条焊缝射线探伤要求,规范了试验方法的相关要求。     

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。     

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。     

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%。     

汽车侧门内开启手柄焊接结构的售后维修方案

塑料焊接工艺广泛应用在汽车内饰件的生产上,侧门内开启手柄也普遍利用热焊接工艺固定在车门饰板上.但在售后维修时,维修技师对内开启手柄的焊接结构缺乏便捷有效的维修方案,无法单独维修内开启手柄,必须更换门内饰板总成,这导致了客户维修成本增加、售后体验变差.采用扣紧螺母将内开启手柄安装在车门饰板上可以满足售后维修要求,该方案可...     

机器人控制系统在整车焊装车间的扩展应用

文章研究论述的是工业机器人控制系统在整车焊装车间的扩展应用,应用于非常规工业机械手的工况.通过提供在整车焊装车间中的运动控制的若干解决方案,解决特定工况下运动控制中存在的成本高、设备占地空间大、故障率高、维护困难等诸多困扰生产线投入运行的课题,以提高焊装车间的生产线技术水平.