Optimization of the heating source in electron beam welding of zirconium pipes

It is shown that the application of a distributed source, formed by an automatic system, in electron beam welding has a positive effect on the structure and corrosion resistance of welded joints in a zirconium alloy with 2.5% niobium.     

Determination of welding speed in electron beam welding of thick components with continuous penetration

An improved method for calculating the minimum permissible electron beam welding (EBW) speed with continuous penetration is described. Calculations are carried out to construct nomograms for determining the welding speed in relation to the thickness of the welded joint and the width of the vapour-gas channel for 40Kh13 steel, 5V titanium alloy and D16 aluminium alloy. To confirm the efficiency of the proposed method, the results of experiments with EBW with continuous penetration at different welding speeds are presented.     

TA12钛合金电子束焊接接头性能和断口分析

利用电子束焊接方法,焊接厚6mm的TA12钛合金板材.通过拉伸实验、持久实验和疲劳实验对焊接接头的力学性能进行研究,同时对疲劳断口进行分析.结果表明:在室温和550℃时,焊接接头强度与母材相当;在室温时,焊接接头的塑性与母材存在明显差异,焊接接头的延伸率与母材相比有所下降;而在550℃时,焊接接头塑性与母材相当或略大....     

伺服焊枪点焊PLC控制系统设计

基于PLC控制器设计了一套伺服焊枪点焊控制系统,该系统集成了伺服焊枪和焊接控制器等设备.焊接过程中,电极定位利用伺服电机的位置环来实现,电极力则通过采集安装在电极杆上的LoadCel压力传感器的反馈压力信号来进行闭环控制,与焊接控制器的通讯则由系统的I/O模块来完成.试验表明,该伺服焊枪系统在焊接过程中电极定位迅速、电极力稳定,并能够有效地提高焊接质量,减少焊接喷溅,延长电极寿命.     

用于钢轨焊接的电子束焊机电源系统

介绍用于钢轨焊接的电子束焊机工作原理及系统组成,分析焊机的电源系统组成。采用软开关技术减少了功率管在高速开通、关断下产生的谐波,降低开关损耗,减小电源系统体积和质量。对电源系统的主要部件进行选型设计,搭建试验电路,编制控制软件,通过调试原理样机,获得试验参数,验证了设计的合理性。该电源系统可以满足钢轨焊接对电子束焊机的要求。     

微波管电子枪激光焊接工艺分析

采用脉冲固体激光器微波管电子枪进行激光焊接工艺试验,利用金相显微镜、扫描电镜、万能材料试验机、电子显微硬度分析仪、X射线衍射仪、振动台、电子枪真空除气系统等研究了电子枪金属零件焊缝焊接表面成形、接头区域的组织形貌、界面元素分布、断口形貌、显微硬度与接头力学性能、焊接接头物相、电子枪随机振动及工作状态下电性能和热性能. 结果表明,优化焊接参数后焊接的电子枪经受了在微波管中连续高温工作的考验. 振动试验和电子枪性能试验检验了电子枪组件的焊接牢固程度和焊接质量,验证了激光焊接工艺在小批量微波管研制、生产和应用过程中的可靠性.     

Preparation of joints in components of rigid plastic for ultrasound welding

An engineering solutions system is considered to substantiate creation of a thin-walled structures industrial process from dissimilar materials, allowing for significant quality increase and for reducing materials consumption of the welded constructions, thanks to the joining efficient selection and optimum process, enabling required composition, structure, and properties of the welded joints.     

电子束焊接数值模拟新型热源模型的初步探索

旋转高斯曲面体热源模型,能较好的反映电子束焊接深熔焊的特点,但只能得到圆滑的“抛物”形焊缝。作者对此进行了改进,使其能较好的反映常见的“酒杯”形或“钉”形焊缝,并采用了ANSYS软件对平板电子束焊接温度场进行了数值模拟,同时从焊缝形貌及试验测得的热循环曲线进行验证,得到了与试验结果较吻合的温度场计算结果。     

基于空间电荷采集实现电子束焊接过程实时监控的装置及方法

为了实现电子束焊接过程的在线监控,保证焊缝成形质量,研制了一套空间电荷信号采集处理系统,系统由传感采集模块、信号处理模块和显示分析模块组成.通过多组6061铝合金平板对接焊接工艺试验,实时采集焊缝熔池正上方8个位置的电荷,分析电荷信号波形特征与焊接成形质量关系规律,建立了波形变化对焊缝成形质量判据准则.结果表明,该系统采集的信号波形能够有效的评价焊接过程稳定性,以及实时判断焊偏、未熔合、焊穿等成形缺陷.     

The effect of the electron beam welding speed on the chemical composition,structure and properties of welded joints in D16 aluminium alloy

Experiments were carried out to investigate the effect of electron beam welding speed in the range 20–120 m/h on the properties of welded joints in 20-mm-thick plates of D16 alloy. The distribution of magnesium in the cross section of welded joints in dependence on the welding speed was determined. The structure of the welded joints was investigated by optical and electron microscopy. The hardness in different zones of the welded joints after welding and different types of heat treatment was measured. The relationship between the chemical composition, structure and mechanical properties of the welded joints produced at different welding speeds was determined.