焊接过程电信号虚拟分析仪的研究

主要介绍基于Windows9.x操作系统、工控机和PCL1800数据采集卡,并利用VC++6.0通过编程实现焊接过程电信号的虚拟分析仪。该仪器将数据采集、数据分析以具有3D立体感的直观界面形象显示在计算机屏幕上。针对CO2焊的电信号,利用电流、电压概率密度分布图和U-I图来提取焊接过程稳定性的特征信息;并对该虚拟分析仪在点焊中的应用进行了试验。试验结果表明该系统功能完善、分析适应能力强且性能稳定。     

基于ANSYS的矿用汽车焊接桥壳有限元分析

提出了SGA3723矿用汽车焊接桥壳的结构设计方案,采用Proe进行三维建模,并用Ansys软件进行了各种工况下的分析计算,计算结果显示改进后桥壳的应力分布满足强度和刚度要求.并大大减轻了桥壳重量即簧下质量,提高了汽车的行驶平顺性.     

脉冲TIG焊熔池几何参数的计算机视觉检测

利用自行建立的基于计算机视觉的脉冲ＴＩＧ焊熔池几何参数检测系统,从工件的正面利用ＣＣＤ传感器拍摄到了清晰的熔池图像,针对熔池图像的特点,设计了快速有效的图像处理算法,实时检测出了熔池的最大宽度、半长、后部面积、后拖角等重要几何参数,为下一步对焊接质量实时控制打下了良好基础。     

短程小口径管线常用焊接工艺的对比分析

从焊缝质量、生产效率、经济性、施工条件适应性等方面,对目前国内短程（２６ｋｍ以内）小口径（１１４．３～ ３２３．８ ｍｍ）管线敷设现场常用的几种焊接工艺予以分析对比,认为纤维素型焊条下向根焊、碱性焊条上向填充和盖面焊工艺是一种适合我国国情、成本低、效率高、安全可靠的新工艺。     

基于集成技术的二维智能焊缝传感器

本文简述了基于GMR的二维焊缝检测传感器.为解决焊接加工自动化过程中焊缝的跟踪检测,将GMR焊枪悬浮高度传感器、焊缝检测传感器以及相应的微处理器有机集成,从而使传感器实现小型化智能化,减少对工件检测的死区范围.该传感器与自动焊接机组成的焊缝跟踪系统,焊缝跟踪精度高、响应速度块,减少了焊缝轨迹空间捕捉算法的复杂性.     

Φ508 mm×9.5 mm L450MB钢级ERW管线管的试制

焊缝冲击功低且不稳定是ERW管线管生产的一大技术难点。针对高钢级L450MB焊管存在焊缝冲击功不稳定的情况,宝山钢铁股份有限公司宝钢分公司钢管厂采取降低焊接速度、调整热处理工艺的技术方案,试制出焊缝冲击韧性符合标准要求的L450MB钢级ERW管线管。     

DESCRIPTION OF A THERMO-INELASTIC BODY WITH A MOVING SOLID/LIQUID INTERFACE AND SIMULATION OF THE WELDING PROCESS

Conservation laws of mass, momentum, and energy for the thermo-inelastic body in the region involving the moving interface between the solid and liquid are introduced to derive jump conditions of velocity, stress, and energy on the interface as the sequence of local form for the generalized Reynolds transport theorem. The jump condition of energy is revealed to be the generalized Stefan condition for moving interface problems. The finite element formulation is used to analyze the modes of flow, deformation, and stresses in a melting or solidifying process by employing a viscoplastic constitutive equation that describes the mechanical behavior of both the solid and liquid phases. The mathematical formalism is applied to simulate bead-on plate welding.     

冷却方式对铝合金薄板搅拌摩擦焊接头性能的影响

采用搅拌摩擦焊技术分别在自然冷却、气流、水流和水雾冷却环境下对铝合金薄板进行焊接试验,对焊缝接头的外观成形进行比较,同时对焊缝接头进行CT扫描、力学性能以及微观组织分析。结果表明:冷却方式是铝合金薄板搅拌摩擦焊接的一个关键因素,在焊接参数相同时,水雾冷却能够得到外表成形美观、内部无缺陷的焊接接头,焊缝接头平均强度为387.8 MPa,达到母材强度的82.5%。     

Influence of hydrogen content on the tensile properties and fracture of austenitic stainless steel welds

This study evaluates the effects of internal hydrogen on the tensile properties and fracture behaviours of a tungsten inert gas (TIG) weld and an autogenous electron beam (EB) weld of a 304L steel tube. Tensile specimens were thermally charged with hydrogen gas to achieve three different levels of hydrogen in these materials. Metallographic examination revealed that the TIG weld contained skeletal and lathy ferrite, whilst the EB weld displayed a fine dispersion of skeletal and vermicular ferrite. Average volume fractions of ferrite in these welds were 8% and 1%, respectively. The tensile data showed that hydrogen increased the yield and tensile strength, and caused a significant loss in ductility, particularly for the TIG weld. Fractographic analysis revealed that hydrogen induced a change in the fracture mode of the welds and promoted cracking at or near ferrite–austenite interfaces. The TIG weld was found to exhibit a higher susceptibility to hydrogen embrittlement than that of the EB and base metal.     

液压油管机器人智能焊接关键技术研究

针对现有液压油管手工焊接存在的焊接效率低、焊缝成型差、工作环境恶劣等方面的问题,开展面向液压油管的机器人智能焊接技术的研究。通过已搭建的整套机器人弧焊平台,开展机器人焊接工艺试验、焊缝跟踪技术、柔性工装夹具设计等3方面的研究,目前部分研究成果已应用于实际生产。