宽带极单层高速电渣堆焊应用性的研究

为检验宽带极单层高速电渣堆焊能否满足加氢反应器内壁不锈钢堆焊层的技术要求,依据某公司的"大面积单层带极堆焊加氢反应器研制"项目技术条件,采用90 mm×0. 5 mm钢带单层电渣堆焊、75 mm×0. 4 mm钢带单层高速电渣堆焊和90 mm×0. 5 mm钢带单层高速电渣堆焊按各自焊接规范进行堆焊试验,对堆焊层厚度、化学成分、力学性能、铁素体含量的稳定性、氢致剥离等方面进行检测分析。研究表明,在一定焊接规范下,75 mm×0. 4 mm和90 mm×0. 5 mm钢带单层高速电渣堆焊技术可用于加氢反应器筒体内壁不锈钢层的堆焊。     

90 mm宽带极不锈钢双层电渣堆焊工艺试验研究

介绍了在2．25Cr-1Mo-0．25V钢上进行的90min不锈钢电渣带极堆焊工艺试验，带极电渣堆焊材料的选择和工艺参数的确定，掌握了磁场控制焊道技术以及通过的理化性能检测，还通过了堆焊层的抗氢剥离试验。     

国产单层带极电渣堆焊焊材在加氢反应器的应用

采用国产75 mm×0. 4 mm钢带及焊剂进行单层带极电渣堆焊焊接工艺评定,并依据焊接工艺评定完成加氢精制反应器内壁堆焊工作,焊接工艺评定及产品通过了验收,产品达到出厂条件,该项目推动了国产单层带极电渣堆焊焊材在加氢等临氢压力容器中的应用。     

一种电渣型不锈钢带极堆焊焊剂

介绍一种新研制电渣型不锈钢带极堆焊焊剂,实际工况试验及综合评定证明其性能及质量符合容器制造要求,可替代进口。     

核电蒸汽发生器管板INCONEL 690镍基合金带极电渣堆焊技术

介绍了蒸发器管板INCONEL 690镍基合金堆焊新工艺──带极电渣堆焊,从带极电渣堆焊的基本原理、堆焊材料的选择和堆焊工艺参数等方面做了基本论述.就INCONEL 690带极电渣堆焊的使用,简述了堆焊工艺试验、工艺评定、模拟试验和产品应用的过程,说明INCONEL 690镍基合金带极电渣堆焊在蒸发器管板上应用是成功的.     

堆焊工艺对镍基276带极堆焊晶间腐蚀的影响规律

采用带极电渣堆焊的方法在SA-516Gr70表面堆焊镍基合金,研究在热处理条件下不同的堆焊工艺对化学成分、显微组织和晶间腐蚀性能的影响规律.结果表明,采用625过渡层+276的耐蚀层带极堆焊,晶间腐蚀率为4.46 mm/a,而采用双层276带极堆焊层,晶间腐蚀率为13.6 mm/a.通过SEM和能谱分析,采用625过渡...     

热高压分离器的带极电渣堆焊技术

根据带极电渣堆焊的特点,把它与带极埋弧堆焊进行比较。结合焊接工艺和车间现场筒体和球形封头的实际情况,通过正确掌握带极电渣堆焊的焊接技术,合理调整筒体和封头的焊接位置,确保了产品的堆焊质量。     

国产焊材大面积带极堆焊的应用

我厂为某化工厂炳烯酸酯工程制造冷凝器。其中管板材质选用16MnR,厚度90mm,直径φ2200,要求在与介质接触面上堆焊超低碳不锈钢耐腐蚀层,堆焊厚度为6～7mm。目前国内大面积堆焊都采用了带极堆焊工艺,本厂对不锈钢堆焊也有成熟经验,但是带极和焊剂全部采用国产材料尚为首次,这次堆焊的成功,说     

核电设备中的镍基合金带极电渣堆焊

以Inconel 690镍基合金堆焊为例,简述了堆焊工艺评定、模拟件试验和产品应用,结果表明：带极电渣堆焊可用于压水堆核电站核岛主设备蒸汽发生器管板大面积镍基合金堆焊。     

90mm宽带极堆焊奥氏体不锈钢的化学成分及铁素体FN分析

分析了TP．309L及TP．347系列不锈钢焊材特点,采用ESAB公司90mm宽带极不锈钢焊材进行堆焊试验,结合大量试验数据,对带极堆焊奥氏体不锈钢的化学成分变化规律及铁素体FN影响因素进行了深入分析。     

Weldability of Copper-bearing Aging Steel

The weldability of copper-bearing aging steel is evaluated using calculated cracking susceptibility index Pcm,oblique Y-groove cracking test,heat-affected zone (HAZ) maximum hardness measurement,submerged arc welding (SAW) test and gas metal arc welding (GMAW) test.The results show that this copper-bearing aging steel has low hardenability and cold cracking susceptibility.SAW test of 40 mm thick plate with WS03 wire matched by CHF101 flux reveals that the welded joints obtain high strength and good impact toughness at low temperature.The HAZ has no hardening but there exists a slightly softening phenomenon.Thus,line energy should be limited or controlled strictly to avoid softening behavior in HAZ during SAW.GMAW tests of 12mm and 24mm thick plates using WER70NH wire show that the tensile strength of joints reaches 720MPa,higher than the stipulated strength requirement of base metal.The average impact energy at-40℃ in the welded joints is more than 140J exceeding minimum stipulated requirement by a wide margin.There are no hardening and softening behaviors in the heat-affected zones of GMAW.All weld metals exhibit acicular ferrite (AF) plus small amount of proeutectoid ferrite (PF) structure,of which the former can significantly improve impact toughness of weld metal.The predominant microstructure in coarse grain HAZ is bainite.     

不锈钢薄板光纤激光焊接的组织与性能

采用GSI的JK-200FL型连续光纤激光器实现了 0.2mm厚304不锈钢片的对接焊.在氩气保护下,优化后工艺参数为激光功率90W,光斑直径0.2mm.焊接速度1200mm/min,获得成形良好,无缺陷的焊缝.采用金相显微镜可见焊缝组织由边缘细小的柱状晶和中心部位细小的等轴晶组成.经硬度测试和弯折测试,表明焊缝处的硬...     

压力容器用大幅面爆炸焊接不锈钢复合板缺陷形成机理

在爆炸焊接宽2600 mm、长10000 mm以上的大幅面金属复合板中,常常发现在对角线附近,离开板角1000~2000 mm处,出现条状不结合缺陷,缺陷宽度一般在80~200 mm,长度为400~600 mm,最大长度可达2000 mm。这种缺陷的出现,严重影响了复合板的整体质量,增加了产品制造成本,限制了爆炸焊接更大面积的金属复合板产品。通过分析界面空间的排气路径,合理地解释了爆炸焊接大幅面金属复合板,特别是不锈钢复合板时,这种缺陷的形成机理,从而采取有效方法和措施来减小和消除这类缺陷。     

低合金耐热钢复合板筒体制造

阐述了δ=90+4 mm的13MnNiMoNbR+00Cr17Ni14Mo2钢大直径筒体的制造、焊接及热处理,并通过各项检测保证了产品质量,从而实现了洗涤塔一次制造成功。     

Some investigations on microstructure and mechanical properties of submerged arc welded HSLA steel joints

This paper investigates the influence of the submerged arc welding (SAW) process parameters (welding current and welding speed) on the microstructure, hardness, and toughness of HSLA steel weld joints. Attempts have also been made to analyze the results on the basis of the heat input. The SAW process was used for the welding of 16 mm thick HSLA steel plates. The weld joints were prepared using comparatively high heat input (3.0 to 6.3 KJ/mm) by varying welding current (500–700 A) and welding speed (200–300 mm/min). Results showed that the increase in heat input coarsens the grain structure both in the weld metal and heat affected zone (HAZ). The hardness has been found to vary from the weld centre line to base metal and peak hardness was found in the HAZ. The hardness of the weld metal was largely uniform. The hardness reduced with the increase in welding current and reduction in welding speed (increasing heat input) while the toughness showed mixed trend. The increase in welding current from 500 A to 600 A at a given welding speed (200 mm/min or 300 mm/min) increased toughness and further increase in welding current up to 700 A lowered the toughness. Scanning electron microscopy of the fractured surfaces of impact test specimen was carried out to study the fracture modes. Electron probe micro analysis (EPMA) was carried out to investigate the variation in wt.% of different elements in the weld metal and HAZ.     

连退机组焊接质量影响模型及其影响因素的研究

针对连退机组焊机焊接带钢过程中焊接参数无法完成优化配置、技术人员无法定量分析焊接质量的问题,考虑连退机组焊机的设备与工艺特点,在分析焊接质量综合影响模型的基础上,选择典型规格带钢,对碾压轮压力、焊机压力、焊接电流、搭接量、焊接速度等影响焊接质量的因素进行了定量分析。通过调整上述因素,使焊接质量综合目标函数值控制在一定范围内,进而获得焊接参数的浮动范围,并根据最优焊接工艺参数进行现场验证,满足了工厂带钢焊接质量需求。同时,将该连退机组焊接质量综合影响模型应用于国内某连退机组焊机实践生产,开发了相应软件,提高了机组的带钢生产效率与成品带钢的焊接质量预报精度。     

单面焊双面成型的焊接工艺试验

针对单面焊双面成型技术的特点,焊接试验采用实心焊丝混合气体保护焊进行打底焊,药芯焊丝CO2气体保护焊进行填充、盖面焊的方法,达到了满意的效果,保证了根部焊缝的熔透性,焊缝成型美观,质量高。     

西气东输二线工程X80钢管半自动焊工艺研究

以西气东输二线工程用X80钢管为研究对象,通过焊接接头横向拉伸试验,焊缝和热影响区（HAZ）冲击韧性试验,焊缝和HAZ不同焊层显微组织分析,以及焊接接头不同焊层Hv10硬度试验等手段,研究了低氢型焊条根焊和自保护药芯焊丝半自动填充、盖面组合焊接工艺的环焊缝的焊接接头性能。试验结果表明,选择韧脆转变温度较低的自保护药芯焊丝、采用较小的焊接热输入量和多层多道的焊接措施等因素,对于保证X80钢管环焊接头的性能是至关重要的。采用低氢焊条根焊、自保护药芯焊丝半自动焊进行X80钢管焊接时,焊接接头的强度、-10℃低温冲击韧性和硬度等性能良好．该工萝应用于西气东输二线工程的焊接旆工是可行的．