高炉焊接中两种焊接方法的适用性研究

在高炉炉壳的焊接中,电渣焊和气电立焊是两种生产效率很高的焊接方法,但由于这两种方法的热输入量很大,将给焊缝和热影响区的组织和力学性能带来不利的影响。本文即通过测定焊接接头的力学性能,来研究电渣焊和气电立焊在高炉焊接中的适用性。     

HHP-25反应堆压力容器接管安全端焊接结构及质量控制研究

鉴于接管与安全端异种金属焊缝是"HHP-25"反应堆压力容器最薄弱的环节,通过研究控制焊接结构、焊接材料、焊接工艺规范等要素对焊缝最终质量的影响,并分析了焊缝力学性能及抗腐蚀性,从应用效果来看,工艺评定和焊接见证件的焊缝质量和性能完全满足设计要求,从而有效保证了此类焊缝的质量。     

模拟焊接热循环试验研究

金属在焊接时所形成的焊缝和热影响区性能常常决定着焊接构件的寿命和使用性能。因为在焊接时,近缝区的金属和焊缝本身都经受一次或数次特殊的焊接热作用,使金属组织和性能发生一系列的变化。如果不事先研究这种焊接热对金属的作用,就有可能在焊接过程中造成缺陷,或在焊接结构的使用过程中引起质量事故。因此必须深入     

马钢2 500m3高炉炉壳焊接工艺

通过对高炉炉壳采用的BBS03钢板进行焊接的工艺评定，确定了其焊接方法。焊后焊缝经超声波100％探伤检查，达到一级焊缝标准，外观检查为优，证明高炉炉壳的焊接工艺是可行的。     

梅山二号高炉崩裂事故分析

本文分析了梅山冶金公司二号高炉崩裂事故的原因,主要是:贴补的焊接结构使得单面搭接焊缝承受了变动的剪切应力、低劣的焊接质量严重地削弱了焊缝强度、不当的冶炼操作加重了焊缝承受的应力等。     

临氢21/4Cr-1Mo焊接接头的回火脆化倾向性

采用步冷试验法对21/4Cr-1Mo钢焊接接头的回火脆化倾向性进行评定试验。结果表明,由于焊缝、焊缝金属的回火脆化倾向性,试验焊接接头焊接热影响区的韧性高于焊接热影响区。由于焊缝和母材的磷含量较低,磷偏聚对回火脆化倾向性的影响较小,而组织结构对韧性和回火脆化倾向性的影响较大。     

气焊有害气体对焊缝金属的影响

气焊是各个厂矿普遍使用的焊接方法之一,而且以手工操作为主。尤其是有色金属及其合金的焊接技术较难掌握,特别是在焊接时有害气体对焊缝金属的影响很大,导致焊缝金属的机械性能及焊接质量发生重大变化。主要对炼铁厂煤粉车间空压机和氮压机的压力表连接接头,在气焊时各有害气体及化合物对焊缝质量影响及消除预防的有效措施加以论述。     

纯镍压力管道的焊接及检验

纯镍材焊接时易引起焊缝金属和热影响区晶粒粗大,易产生热裂纹、气孔等缺陷,通过优化焊接工艺和焊后的检测手段可以保证其焊接质量,从而保证设备的安全运行。     

高炉螺旋风口的可焊性分析及工艺研究

1.前言 螺旋风口是向高炉内鼓风的孔道,其材质为紫铜,它由内芯和外套焊接而成,内通冷却水,螺旋风口始终在熔融渣流、铁流和高温焦炭的冲刷和撞击下工作,其工作环境是相当恶劣的,因此,造成其破损的机会很多,特别是当高炉工作失常时,崩料、坐料、炉冷等对风口的损坏就更加频繁,如果风口焊缝质量差,那么其焊缝及热影响     

提高窄搭接焊机焊接高强钢稳定性的研究

使用窄搭接焊机焊接1 500 MPa级热成型钢时,因碳当量较大,焊缝处容易发生脆断问题。通过对焊缝进行金相检测及电镜观测,分析焊缝缺陷,并相应地调整焊接参数,从而得到良好的焊接质量。在对厚规格980 MPa级双相钢进行自身焊接时,焊缝会偶发开裂问题,使得产线无法实现稳定运行,通过采用碳当量较低的普材跟厚规格980 MPa级双相钢交替焊接,焊接质量良好。通过总结这两种高强钢的焊接经验,举一反三,将其应用到其他高强钢种的焊接上,提高了窄搭接焊机焊接高强钢的稳定性,避免了带钢因焊缝焊接质量差而发生断带的风险,从而保障了高强钢的稳定生产。     

Comparative Study on Processing Property Between CWW CO2 Gas Shielded Welding and SAW

 Cable welding wire (CWW) CO2 gas shielded welding is an innovative process arc welding with high efficiency, high quality and low consumption, in which cable wire is used as consumable electrode. CWW CO2 gas shielded welding and submerged arc welding (SAW) are used for contrast studies on processing property of high strength steel A36 used in ship structure. The results show that the shapes of weld seam, using CWW CO2 gas shielded welding and SAW, are good and no weld defect such as air hole, flaw, slag inclusion, incomplete fusion, lack of penetration and so on are found in the weld seam. Because the rotating of arc during CWW CO2 gas shielded welding process has a strong stirring effect on molten pool, the grain in the heat affected zone (HAZ) of the joints, using CWW CO2 gas shielded welding, is small. Tensile failure positions of joints by CWW CO2 gas shielded welding and SAW are all in the base metal, but tensile strength of CWW CO2 gas shielded welding joint is higher than that of SAW joint by an average of 2. 3%. The average impact energy of HAZ, using CWW CO2 gas shielded welding and SAW, is almost equal, but the average impact energy of the weld seam using CWW CO2 gas shielded welding is increased by 6%, and the average impact energy of the fusion line is increased by 7%. The 180° bending tests for the joints of CWW CO2 gas shielded welding and SAW are all qualified, and the joints hardness is all less than HV 355, but hardness of CWW CO2 gas shielded welding wire welding joint near the fusion line is obviously lower. It can be concluded that the properties of CWW CO2 gas shielded welding are better than those of the SAW joint, and CWW CO2 gas shielded welding is suitable for welding high strength steel A36 used in ship structure.     

含钛焊丝钢冶炼工艺优化

本钢北营炼钢厂在开发高钛含量焊丝钢时,经常出现浸入水口结瘤、铸坯卷渣、钛收得率低等问题,特别是铸坯卷渣严重影响轧后盘条表面质量。分析认为,高熔点的Ti N、Ti O2及Al2O3非金属夹杂物是导致浸入水口结瘤的主要原因。通过控制钢中氮含量、强化精炼渣中脱氧、优化浇注过程工艺等有效手段,提高了高钛含量焊丝钢连浇炉数、盘条成材率等质量指标,优化效果显著。     

新型埋弧焊烧结焊剂的研制

研究了各种成分对MgO CaF2 Al2O3 MnO渣系焊剂焊接工艺性能和熔敷金属中扩散氢含量影响的规律,并在此基础上研制出了一种碱度BⅡW为2 3、脱渣性良好、焊缝成形美观、熔敷金属中扩散氢含量达到低氢水平、与合适的焊丝配合适于焊接有-20℃低温冲击韧度要求、且抗拉强度达到650MPa级的低合金钢埋弧焊焊剂。     

Fe-VC复合材料与45~#钢的钨极氩弧焊焊接

采用钨极氩弧焊(TIG)和奥氏体不锈钢焊丝ER309L作为填充金属,对Fe-VC复合材料与45#钢的可焊性进行了研究.借助X衍射仪、扫描电镜分析焊缝金属的物相结构和组织形貌;应用电子探针测试了合金元素在焊缝中的成分分布;按照国家标准,测试了焊接接头的拉伸强度.结果表明:复合材料与45#钢实现了良好的冶金结合,合金元素在焊缝中呈梯度分布,拉伸试样的断裂位置均在复合材料处,表明所采用的焊接方法可靠,能够满足异种金属的焊接要求.     

Laser Welding of Ultra-Fine Grained Steel SS400

Steeliswidelyusedbecauseofitsgoodcompre hensive properties ,plentyofresourceandlowerprice .Thestrengthandtoughnessaretwoimpor tantpropertiesofsteels ,andpeoplemakeeffortstoincreasetheirvalues .Addingalloyingelementandcontrollingmicrostructurearetwobasicwaystoac complishtheaim .Therefinedmicrostructureob tainedbyprocessingtechniqueenablesthestrengthandtoughnessofsteeltobeincreasedwithoutaddingalloyingelementandtheratioofperformance costtobeincreased .Theultra finegrainedsteelshavefer ritegrains…     

建筑结构用抗层状撕裂特厚板的焊接

宝钢开发的建筑用Q345GJ、Q420等抗层状撕裂低合金高强特厚钢板,满足国内日益增多的高层和超高层钢结构建筑与场馆建设需求。建筑用高强钢特厚板焊接是其应用的关键,宝钢开发了与该特厚板配套高效的埋弧焊接材料BH500J-III焊丝。采用高效的双丝埋弧焊接方法及其焊接材料,可达到所需的焊接接头强度和冲击韧性。     

铝及铝合金焊丝的研究与发展现状

随着铝合金焊接结构的广泛应用及铝合金焊接技术的发展,铝合金焊丝愈加受到人们的关注.本文主要介绍铝合金焊丝的化学成分、产品性能及选择原则,阐述其生产工艺的发展现状,指出我国焊丝生产存在的问题,展望铝合金焊丝的发展趋势.     

TANDEM and GMAW Twin Wire Welding of Q690 Steel Used in Hydraulic Support

 Compared with using semi-automatic gas shielded arc welding, using automatic TANDEM twin wire welding and twin wire gas metal arc welding (GMAW) to weld Q690 steel, a low-alloy high-strength structural steel used in the hydraulic support in the fully-mechanized mining face, the welding speed, deposition rate, production environment and welding quality can be obviously improved. Compared with GMAW twin wire welding, a refined microstructure in the weld and heat-affected zone (HAZ), narrow HAZ and improved joint strength were achieved with TANDEM on Q690. Also, due to the push-pull pulsed way in TANDEM welding, the droplet transfer, distribution on heat flow and interaction between two arcs were completely different from those in GMAW twin wire system. The heat input of TANDEM is only about 766% of GMAW, and correspondingly, the welding speed and welding seam can be obviously improved. The complete oscillation caused by TANDEM pulsed current occurred in the welding pool, which refined the grains in the microstructure. The results show that TANDEM twin wire welding is very suitable in the welding of Q690 used in the hydraulic support.     

高性能WNQ570桥梁钢厚板熔透角接试验研究

本文介绍新一代高性能WNQ570桥梁钢厚板熔透角接试验研究情况。研究结果表明,采用WER60气保护焊丝及富氩工艺焊接WNQ570钢,焊接接头具有优良的综合性能。采用的焊接工艺及焊接材料达到了大跨度桥梁钢接头性能指标。     

Research on the Welding Process of 590MPa Grade High Strength Automobile Beam Steel

590 MPa automobile beam steel strips are used mainly to manufacture the longitudinal beam of trucks.It’s welding properties are critical to the safety of truck.The microstructure and mechanical properties of welding joints processed by CO 2 arc welding with different welding parameters were studied.The results showed that the welding joints were weak when welding heat input were small and the non metal inclusions were found in the weld joints when welding heat input are big.The quality of the welding joints is good enough at 170A of the arc current and 24V of the arc voltage.Keeping the other welding parameters fixed,the incomplete fusion defect occurred in the welding joint with backward welding,but the quality of the welding joint is good with forward welding.