共查询到20条相似文献,搜索用时 546 毫秒
1.
2.
3.
4.
5.
XU Ke 《Baosteel Technical Research》2021,15(4):28-36
Laser-arc hybrid welding has the characteristics of optimal surface formation and greater penetration;it is extensively used in the welding of plates of medium thickness.However,for hybrid welding of lasers,the welding seam cooling rate is rapid;thus,the welding seam has a higher tendency to significantly harden,which has a negative impact on the weld quality of the high-strength low-alloy(HSLA)steel plates of medium thickness.In this study,laser-arc hybrid welding is performed on the BG890QL HSLA steel produced by Baoshan Iron&Steel Co.,Ltd.,and the quenching tendency of the welded structure is examined.The results demonstrate that the specific growth direction of the columnar crystal structure of the laser-arc hybrid welded joint is obvious.However,at the center and top of the welded seam,there are equiaxed crystals.The impact properties at room temperature and-40℃of the weld area are 58.0 J and 40.0 J,respectively,and those of the heat-affected zone(HAZ)are 147.0 J and 66.5 J,respectively.The impact performance can meet these requirements.Laser-arc hybrid welding of HSLA steel can yield strong and durable welds and the HAZ structure to meet the requirements of engineering applications. 相似文献
6.
《钢铁研究学报(英文版)》2015,(10)
In order to investigate the CO2 corrosion behavior and the grooving corrosion susceptibility of electric resistance welded tubes of the Q125 grade,the high temperature and high pressure autoclave was employed to conduct CO2 corrosion experiments for the welded joint.The mechanisms of grooving corrosion and the factors influencing grooving corrosion susceptibility were identified by electrochemical measurement,microstructure observation,residual stress examination,micro-region composition and orientation analysis.The CO2 corrosion results show that the corrosion resistance of the base material is the best,followed by heataffected zone and the welded seam is the worst.The grooving corrosion occurred in the welded seam,and the grooving corrosion susceptibility of welded seam is relativity high.The dominated reason for the grooving corrosion of the electric resistance welded joint is the notable inclusions consisting of Mn S as the main content in the welded seam.The proportion of high-angle grain boundaries in the welding zone is higher than that of base metal and the heat affected zone,which plays an important role in the corrosion behavior of the welded seam. 相似文献
7.
针对热连轧厂生产的Q345B冷弯型钢用钢带在生产矩形管过程中出现的焊缝开裂、热影响区压扁开裂和弯曲弧开裂问题,通过对Q345B带钢成分、组织、夹杂物、气体、硫偏析等检验、分析以及对焊接工艺研究,得出焊接工艺不合理是造成焊缝开裂和热影响区压扁开裂的主要原因;原料中夹杂物多、带钢中存在的孔洞(或微裂纹)是造成弯曲弧开裂的主要原因。通过改进焊接工艺、减少钢中硫含量和提高钙处理效果等提高了矩形管合格率。 相似文献
8.
16mm厚Q345D钢板不需开坡口,双面单层埋弧焊接,成功地焊接了天车梁腹板的一级对接缝,生产效率提高,焊缝质量良好。 相似文献
9.
对1.0 mm厚度的S43932不锈钢冷轧板分别进行88、101、132、188 J/mm的钨极氩弧焊焊接,研究了焊接区的显微形貌和相组成。详细分析了垂直焊缝、平行焊缝和带缺口焊缝试样的拉伸性能及焊缝杯突试验结果,当热输入为101 J/mm时,焊接接头具有最佳的拉伸及成形性能匹配,之后随热输入>101 J/mm,焊接接头抗拉强度和埃里克森杯突值急剧下降。焊接接头良好的力学性能与焊接区小尺寸晶粒的形成及大量富Ti(Nb,Ti)(C,N)相的析出有关。 相似文献
10.
大直径直缝焊管主要用于石油、天然气、水煤浆及各种液体的管道输送.鞍钢拥有丰富的宽厚板资源和优秀的技术人才,已具备了建设整套大直径直缝埋弧焊管机组的条件.对大直径直缝焊管的需求前景、主要生产工艺以及鞍钢建设大直径直缝埋弧焊管机组的可行性进行了探讨. 相似文献
11.
In this study, X80 pipeline steel was welded by self-made welding electrode with different Cu/Al ratios in flux coating. The microstructure and mechanical properties of X80 steel welding seam were investigated by optical microscope, energy-dispersive spectroscopy, scanning electron microscope, X-ray diffraction. The hardness, tensile and impact tests were carried out. The electrochemical corrosion and uniform corrosion properties of welding seam were also studied in sulfide environment. The experimental results reveal that alloying agent such as Cu and Al can transform to the welding seam very well. Furthermore, the microstructure and properties of welding seam can be improved effectively with a suitable Cu/Al content ratio. By reducing the Cu/Al content ratio, the mechanical properties and corrosion resistance properties increase initially and then decrease. When the Cu/Al ratio is maintained at 6:2 in the flux coating, the welding seam has more acicular ferrite, resulting in the best mechanical properties and corrosion resistance. Moreover, the addition of Cu and Al elements does not result in a serious deterioration of the resistance to HIC. 相似文献
12.
13.
14.
采用显微硬度及电导率测试,剥落腐蚀及电化学腐蚀试验,光学显微镜(OM)及透射电镜(TEM),研究经ER5356焊丝钨极氩弧焊(TIG)的7003铝合金型材焊接接头各部分的微观组织与性能。结果表明:在离焊缝中心30 mm左右的热影响区位置形成硬度较低的软化区,这是由于η′(Mg Zn2)相的长大粗化;焊接接头的耐蚀性依次为焊缝区过时效区母材区淬火区,其原因是淬火区的晶界析出相连续分布,形成连续阳极腐蚀通道,增大了应力腐蚀及剥落腐蚀倾向,使得腐蚀性能很差;而过时效区和母材区的晶界析出相不连续,耐蚀性较好。 相似文献
15.
随着中国钢铁、冶金与电磁等交叉学科的快速发展,焊接钢管产量及质量日益提升。高频感应加热是生产焊接钢管的核心工序,获取更加精确的焊管高频加热过程的应力分布和微观组织演化规律,是进一步提升焊管品质的关键要素和学者们关切的问题。综合考虑热传导和微观组织转变对应力的影响,针对高频焊管特有的沙漏形热源形貌,定量分析了焊接热影响区微观组织演变过程和残余应力的分布规律,获得了考虑热应力和组织应力的残余应力分布。发现该应力特点为在焊缝附近轴向残余应力较大,最大等效残余应力出现在距焊缝中心1/2壁厚处的热影响区,在壁厚方向管材内部的中间层的残余应力较大,且应力分布与反映高频焊接热源形貌特征的加热温度峰值和加热温度宽度相关。而在焊缝中心处,未考虑组织变化的等效残余应力值是考虑组织变化的1.3倍。掌握焊管高频焊接应力和组织演变的特点和规律,可为优化高频焊接工艺提供理论依据,对提升高频焊管质量具有重要意义。 相似文献
16.
采用钨极氩弧焊和手工电弧焊焊接316L/X65双金属复合管。利用光学显微镜、能谱仪、扫描电镜、力学性能测试及电化学测试等分析手段研究了复合管焊接接头的微观结构、化学成分、力学性能及电化学腐蚀性能。结果表明,过渡层焊缝的化学成分受到稀释较小,过渡层熔合线附近出现了元素迁移,不锈钢层焊缝与母材的化学成分基本一致;扩散层为类马氏体+残留奥氏体,过渡层和不锈钢层焊缝均为奥氏体+少量铁素体;在试验参数下,焊接接头各项力学性能优良、无缺陷;覆层焊缝与母材的电化学腐蚀性能相差极小。 相似文献
17.
高强度焊管去毛刺硬质合金刀具的研制 总被引:1,自引:0,他引:1
去毛刺刀是清除焊管内外焊缝毛利的专用硬质合金刀具,其几何精度、合金的内在质量和性能指标均有较高的要求。本文介绍了为引进焊管机组生产线配套而研制的硬质合金去毛刺刀具,该合金通过采用强化球磨、添加组元等有效的工艺控制手段,使所研制的合金具有细晶粒组织和良好的高温使用性能,取代了进口产品,具有显著的经济效益和社会效益。 相似文献
18.
桥式起重机是大质量物品的重要运输工具,在实际工业生产中的有着广泛的应用,在多种因素的影响下桥式起重机大梁与端梁时常有开裂的情况发生。桥式起重机大梁和端梁的主要结构形式是焊接结构,开裂最容易出现在焊接部位。在本次研究中以某冶炼厂现役桥式起重机为调查对象,采用测量法和现场调查法结合有限元方法对桥式起重机频繁出现的裂缝进行研究,对桥式起重机的大梁和端梁结构进行了应力测试,并结合实际开裂情况,从材料、制作工艺、焊缝布置、大梁和端梁疲劳受力状况等原因进行了分析,找出了导致焊缝开裂的原因,同时探讨了焊缝的修补方法和对大梁与端梁的加固措施,并经实践论证,此处理方法有效地延长了桥式起重机的寿命,有效减少了安全隐患。 相似文献
19.
因锌合金不易焊接,采用加入焊剂的方法对新型模用锌基合金(ZA合金)进行了TIG焊接。通过金相显微镜、X射线衍射等分析方法对焊接接头组织及焊后残渣采样进行分析,并对焊剂的作用机理进行了初步研究。结果表明:焊接过程中,焊缝表面形成大量氧化物;加入焊剂的主要作用是通过冶金反应清除焊接材料表面的氧化膜,同时向焊缝中过渡Zn。 相似文献
20.
V. I. Danilov A. N. Smirnov V. V. Gorbatenko D. V. Orlova L. V. Danilova 《Steel in Translation》2018,48(2):87-92
The elastoplastic transition in welded low-carbon steel samples is considered. Two methods of manual arc welding of floating-electrode type are employed: a traditional steady arc; and pulsed welding with controlled heat consumption. In terms of the structural characteristics and mechanical properties of the welded metal, the methods are identical. In both cases, extended elastoplastic transition by the nucleation and propagation of Luders bands is observed. However, the underlying process is different. In the traditional steady arc, the Luders bands are formed in the applied metal initially as diffuse regions where the deformation is localized. These regions fill the seam and convert it to the plastically deformed state. The moving fronts of the bands are finally shaped in the thermal-influence zones and pass to the basic metal. The velocity and morphology of the fronts match those of fronts in uniform objects of the same steel. When using a pulsed arc, Luders bands appear some distance from the weld seam, at the clamps of the loading device. Up to the thermal- influence zones, the velocity and morphology of the fronts correspond to those for the basic metal. At the fusion boundary, the front stops and forms the nucleus of a new band, which expands in the seam metal. This new band first transforms the applied metal to the deformed state and then creates a moving front in the opposite thermal-influence zone. The velocity of the front differs by an order of magnitude in the applied metal and the basic metal. The weld seam determines the nucleation of Luders bands. An explanation is offered for the different origins of the elastoplastic transition in the two welding methods. In traditional welding with a steady arc, the local long-range stress is considerably higher in the thermal-influence zones than in the basic metal. Therefore, the nucleation of Luders bands is a relaxational process in this case. In pulsed arc welding, the local long-range stress is higher in the basic metal, where the Luders bands appear. The results may be used in selecting the test conditions for power-system equipment. 相似文献