φ114mm直缘成型焊管机组的研制

简介了研制的φ１１４ｍｍ直缘成型焊管机组的技术性能和工艺特点。与普通辊式成型机组相比，该机组工艺先进，焊管精度高。     

摩擦焊机液压施力系统压力特性对比分析

为分析采用电液比例计算机闭环系统进行摩擦焊接过程控制的必要性及可行性,对比分析了分别由开关阀和比例溢流阀组成的两种摩擦焊机轴向压力施力系统的静动态特性,以及长期生产过程中轴向压力波动规律,重点分析了油温对轴向压力参数的影响.结果表明,比例阀控制系统轴向压力的静、动态特性均优于开关阀系统;在长期焊接生产过程中,比例阀控制系统的轴向压力不受液压系统油温影响,比开关阀系统稳定,控制精度高,重现性好.     

国外部分无损检测标准点评

概述美国ASME、欧洲EN，ISO以及日本JIS等标准的主要特点，提取有关焊接接头无损检测标准的最新亮点，旨在为我国重要标准的国际接轨提供借鉴。     

蒸汽发生器关键焊接技术

":华龙一号"蒸汽发生器是我国自主研发的三代核电技术,主要介绍其结构特征、关键部位使用的焊接材料和工艺要求,并详细论述了下封头内壁不锈钢堆焊、管板堆焊、管子/管板封口焊、接管安全端焊接技术等关键焊接工艺的实现方式,为后续"华龙一号"蒸汽发生器的批量化制造奠定了基础,提供了有力的技术保证。     

Guide for Authors

ACTA METALL. SIN. (Eng. Lett.) is published bimonthly and mainly contains short reports of significant, original and timely researches which reflect new progress in metallurgy, materials science and engineering fields, including materials physics, physical metallurgy and process metallurgy covering the areas of mining and ore dressing, production metallurgy, foundry, metal working, testing methods, powder metallurgy, composites, welding and joining, oxidation and corrosion, etc.     

运用电焊条专用润湿剂改善焊接接头质量的研究

通过大量试验研究表明，当前市售的J422、A102等电焊条，在施工过程中，由于熔渣和液态金属对固态金属、熔渣时液态金属还缺乏良好的润湿作用，使焊接接头熔合区极易产生如咬边、夹渣、焊瘤、未熔合、熔合带不平缓等缺陷。因此通过上述润湿作用对焊接接头熔合区影响关系的探讨，从改进焊条配方入手，研制出一种新型的电焊条专用润湿剂。此润湿剂能有效地改善该类电焊条产品的焊接工艺性能及焊接接头质量，提高经济效益。     

高温运行对镍基异种金属接头力学性能的影响

对12Cr1MoV和0Cr17ni12Mo2两种管材的镍基异种金属接头进行焊后状态和高温运行后状态对比试验。结果表明，高温运行使异种钢接头σ-ε图中曲线移动，反映了高温运行后异种钢接头的屈服强度和塑性有所下降；高温运行使异种钢接头的各项力学性能指标σb,σ0.2,δ5,ψ均略有下降，该结果与接头组织变化及12Cr1MoV钢珠光体组织中碳化物球化倾向等不利因素有关；高温运行对异种钢接头断口部位及宏观断口形貌特征无大的影响；高温运行后异种钢接头拉伸试样仍断在母材处，表明镍基异种钢接头的抗拉强度是比较满意的。     

Analysis on the joint tensile strength and fractography of TiNi shape memory alloy precise pulse resistance butt welding

This paper studies mechanical property and fiactography of the welded joints obtained in different welding parameters such as welding heat and welding press wlth/without gas shield in TiNi shape memory alloy precise pulse resistancebutt welding using tensile stength test, XRD, SEM and TEM measures. The optimum welding parameters obtaining high tensile strength welded joint are SOL On the condition of welding press magneting current 2 A and welding heat 75%, the joint strength is the highest. This is important for to study other properties of TiNi shape memory alloy further. The experimental results state that argon gas shield haze different effects on different welding parameters, less on welding press,but great on welding heat. But excessive welding press and welding heat have great effects on joint tensile strength. Too high welding heat can produce the new intermetallic compound, this intermetallic compound lead to dislocation density to increase and form the potential crack initiation, which can easily make the flint fracture under stress effect and decrease the shape memory ratio of joint for high density dislocation groups existing in the twinned martensite.     

上海船舶工业展望与船舶焊接应用

船舶焊接技术在船舶制造中占有重要的地位,是一项技术性、专业性很强的系统工程.先进的造船高效焊接技术,在提高船舶的建造效率、降低船舶建造成本、提高船舶建造质量上发挥重要作用,也是企业提高经济效益的有效途径.