【摘 要】
：
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
【机 构】
：
Research Institute,Baoshan Iron&Steel Co.,Ltd.,Shanghai 201999,China
论文部分内容阅读
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.
其他文献
本文结合检验中遇到的实际案例,分析了几种常见的制动器故障保护线路连接方式,并探讨了制动器故障保护项目具体的检验方法以及现场快速排查线路缺陷的试验方法.
随着环保要求的不断提高,市政排水管网疏通清捞出来的通沟污泥的合规处置成为亟待解决的问题.从产城融合的角度,依托宝武集团宝山基地的产业、技术、资源优势,将宝山区通沟污泥通过干化、热脱附预处理后混合生产水泥铁质校正料,实现了宝山区通沟污泥“规范化、无害化、资源化”的环保处置,为钢厂融入城市、解决城市难点和痛点提供了一条路径,为钢厂与城市的和谐共生作出了贡献.
在长时间高温高压运行条件下,注汽管道材料加速老化,为安全生产运行带来一定风险.因此本文通过拉伸实验和原位形貌观察对比研究了服役前后高压注汽管道典型材料16Mn的力学性能变化规律以及预变形和时效处理对16Mn的力学性能.
本文通过介绍电梯故障发生的特点,以及分析电梯故障产生的原因,并针对电梯运行过程中的电气故障进行分析,提出了对电梯维护保用人员的责任要求,以及电梯故障预防措施和七点应对故障的排除方法,为全面提升电梯运行安全提供了借鉴和参考.
对于现有的扶梯相关标准中,梯级静载及动载下的变形量要求,目前的测试手段都是通过传统的接触式测量方法(位移传感器、应变片)来测量整个梯级的最大变形量和挠度.项目研究小组通过采用三维变形检测技术,解决了传统梯级最大变形量和挠度测量不直接、测不准的问题,减少了不符合标准要求的梯级产品的应用,提高了扶梯的安全质量.
Submerged arc welding(SAW)and gas metal arc welding(GMAW)experiments of Nb-bearing X80 steel were conducted with high-toughness wires.The inclusions in weld metals were analyzed in terms of their types and sizes.In GMAW,the inclusions are primarily Ti,Ca,
As a material with great potential,steel has been contributing to society through its rich properties.Baowu is the world\'s largest steel firm,producing carbon steel,stainless steel,and special steel,which are widely utilized in transportation,energy,ma
Coarse grain heat-affected zone samples of X80 pipeline steel under different heat inputs were obtained through thermal welding simulation experiments with Gleeble 3500.Charpy impact tests and a combination of multiscale characterizations were conducted t
以起重机械的电气系统为例,本文从安装检验问题、安全装置功能不全、电气故障问题方面阐述了起重机械常见的检验问题,并从识别安全风险源、隔离开关、零位保护、电路与失压保护、断电开关、过载与超速保护方面探究了起重机械的电气检验方式.
Pipeline transportation is an economical,safe,and efficient transportation method for transporting oil,natural gas,mineral slurry,and other fluids.Welding is the most critical construction process in pipeline engineering and is crucial in the safe operati