拼焊法兰焊接变形和控制

拼焊法兰在焊接过程中产生焊接变形,焊接变形大小将直接影响法兰尺寸精度,本文介绍了法兰的制造和焊接工艺,分析了法兰变形产生的原因,并提出了控制法兰焊接变形的工艺措施。     

新型对称施焊法在海洋工程钢结构焊接变形中的应用研究

海洋工程钢结构具有体积大、工序复杂的特点,传统的焊接技术下的焊接产品无法满足海洋工程钢结构的使用需求。钢结构焊接变形和应力变形的控制措施是焊接技术的关键。基于此,本文提出一种利用对称施焊方法来控制钢结构焊接变形和应力变形。通过确定焊缝变形收缩比例、降低焊接残余应力以及焊接后构件变形矫正等一系列组合措施来控制钢结构焊接变形。最后经过检测确定了对称施焊法下的钢结构焊接构件具有较强的变形可控能力。     

焊接应力和焊接变形控制

对压力容器和一般钢结构焊接中焊接变形和焊接应力的各种影响因素进行了分析,提出了控制焊接变形和消除焊接应力的措施。     

焊接应力和焊接变形控制

对压力容器和一般钢结构焊接中焊接变形和焊接应力的各种影响因素进行了分析,提出了控制焊接变形和消除焊接应力的措施。     

Q235薄板箱体焊接变形控制

油箱在焊接生产时出现焊接变形,未能达到标准要求,通过研究薄板结构焊接过程中的变形规律及其控制方法,提高了产品质量,增强了产品的市场竞争力,对相似工件的焊接加工具有重要的参考意义。箱体焊接变形的根本是焊接应力,产生焊接应力的因素很多,其中最根本的原因是箱体焊接时受热不均匀。在焊接过程中常见的焊接变形有收缩变形、弯曲变形、波浪变形和角变形等。本文对某型号油箱外型进行三维复现,如图2,并对重要焊缝进行应力应变分析,提出了选择合理的焊接顺序、焊接方法等具体的控制焊接变形的措施。通过分析确定油箱焊接方法为CO2气体保护焊工艺。     

大型沉降槽底板的焊接

对大型沉降槽底板焊接变形的原因进行了分析 ,并提出了合理的安装和焊接顺序 ,有效地控制了槽底的焊接变形     

10000m~3大型液氮储罐底板焊接变形控制

通过对大型储罐底板焊接变形产生的机理和变形原因的分析,结合生产实践,制订了10000m3大型氮储罐控制底板焊接变形的工艺措施,施工过程中取得较好效果。提出了防止焊接变形的技术措施。     

化工容器生产中焊接应力与变形的控制

为了有效控制化工容器因焊接过程的不均匀性而造成的焊接变形,现就焊接变形和焊接应力的各种影响因素进行分析,以便提出相应的控制措施。     

φ42m沉降槽底板的焊接变形控制方法

对大型沉降槽底板焊接变形的原因进行了分析,并提出了合理的安装和焊接顺序,有效地控制丁槽底的焊接变形。     

浅析焊接变形与控制

本文针对产生焊接变形的机理，分析焊接变形的各种类型并提出简单公式估计变形量，控制产生变形的技术措施，供同行借鉴。     

储罐焊接中防止变形的一些建议

通过对焊接施工产生变形的原因分析研究,找出在工程质量控制中,严格控制人员、机械设备、工程材料及施工方法,并且着重探讨施工方法及其注意事项,最终确立合适的焊接顺序。因为焊接顺序对焊接残余应力和变形的产生及分布影响最大,采取合理的施焊顺序,可以有效的减小焊接残余应力和防止焊接残余变形。     

防止大型油罐底板焊接的变形

为防止大型油罐罐底板的焊接变形,可从底板的结构设计,焊接方法等方面得以解决     

堆焊管板平面度的控制

影响管板堆焊变形的因素包括管板材料、几何形状、焊接材料和焊接工艺。管板堆焊的模式分为两大类。按照不同类别的堆焊模式采用工程计算的方法计算管板的变形量,是控制堆焊管板平面度的有效措施。管板与壳体组焊后的平面度是需要确保的堆焊管板的最终平面度。     

料仓焊接变形问题的原因及控制方法

以铝料仓的焊接变形问题为例,阐述了现场材料加工、设备制造的优缺点,分析了引起焊接变形的一些内在和外在因素,给出减低焊接变形的经验工艺方法.同时,为保证现场材料加工制造质量,从材料过程控制角度,有针对性的提出了,原材料制造、运输、保管、发放,到切割成材,焊接成型侦用的铝料仓现场制造的过程管理方法.     

Study on the friction interface evolution during rotary friction welding of tube

In this study, evolution characteristics of the friction interface during rotary friction welding of tube were investigated. The friction interface that obtained at different welding stage were observed by confocal laser scanning microscopy. The results show that the friction interface transforms from sliding friction state to visco-plastic deformation state when the welding torque reaches the peak value. In addition, based on the thermodynamic framework extracted from the maximum entropy production principle, an analytical model for transition criterion from sliding friction to visco-plastic deformation was established. The model was verified by the corresponding experimental results of eight alloys, which indicated that the accuracy and generality of the model is satisfactory.     

如何控制大型储罐底板的焊接变形

通过对大型储罐底板焊接变形产生的原因的分析,提出大型储罐底板焊接过程中控制变形的措施。     

车架大梁自动焊夹具设计及应用

针对车架大梁的焊接结构,对焊接夹具进行合理设计,减少焊接变形,实现自动跟踪焊。     

Effect of different welding parameters on residual stress and deformation of 20/0Cr18Ni9 dissimilar metal arc-welding joint

Abstract

Pipelines used for the petrochemical, energy, and other industries contain 20 steel and 0Cr18Ni9. This paper based on the finite element simulation software Simufact Welding, the residual stress field and deformation results for 6-mm-thick 20/0Cr18Ni9 plates were examined by combining numerical simulation with experimental verification and performing an orthogonal experiment of three factors on different welding parameters. Herein, the thermodynamic coupling, isotropic hardening model, viscoplastic model, moving heat source are considered, and the experiments confirm the welding residual stress and deformation. The experimental results show that the stress distribution of each model is similar and the maximum stress appears in the fusion zone. Furthermore, the longitudinal residual stress is substantially greater than the transverse residual stress, whereas the minimum stress distribution is observed in paramaters of heat input 13493?J (welding layer 1) and 22400?J (welding layer 2), interpass temperature 50?°C, ambient temperature 65?°C. The minimum deformation occurred in paramaters of heat input 5913?J (welding layer 1) and 9200?J (welding layer 2), interpass temperature 250?°C, ambient temperature 65?°C, whereas the maximum deformation occurred in paramaters of heat input 13493?J (welding layer 1) and 22400?J (welding layer 2), interpass temperature 250?°C, ambient temperature 20?°C. Finally, the paramaters of heat input 7077?J (welding layer 1) and 11440?J (welding layer 2), interpass temperature 50?°C, ambient temperature 20?°C were selected to conduct the actual experiment and verify the residual stress and deformation. The results showed that the simulation results agreed with the actual results, thereby confirming the model’s reliability.     

Numerical simulation optimization for laser welding parameter of 5A90 Al-Li alloy and its experiment verification

Weight reduction is very important to aircraft. Laser welding technology is beneficial to reduce the weight of aircraft structure. However, due to the unclear laser welding properties of Al-Li alloy, the research on laser welding of Al-Li alloy is necessary. In current study, the temperature field, stress field and deformation of laser welding are simulated. The optimal welding parameters are obtained by simulation, which are used to weld the real Al-Li alloy sheet. Besides, the microstructure and mechanical property of welded joints are analyzed. It is found that the simulated optimal welding parameters are suitable for welding real Al-Li alloy sheet. And the simulation results are consistent with the experimental results.     

Q345R和OCr18Ni12Mo2Ti复合板的堆焊工艺

对碳钢表面堆焊不锈钢进行了介绍,论述了此类管板堆焊的施工工艺。在施工过程中,通过焊接顺序、焊接工装和层间温度控制等措施来控制堆焊时的焊接变形。